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- 增加DynamicEntity立nuget包
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d4ilys
parent
64c9d0bdee
commit
b17c2ef4a5
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using System;
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using System.Collections;
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using System.Collections.Concurrent;
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using System.Collections.Generic;
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using System.Linq;
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using System.Linq.Expressions;
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using System.Reflection;
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using System.Reflection.Emit;
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using System.Security.Cryptography;
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using System.Text;
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namespace FreeSql
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{
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/// <summary>
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/// 动态创建实体类型
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/// </summary>
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public class DynamicCompileBuilder
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{
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private string _className = string.Empty;
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private Attribute[] _tableAttributes = null;
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private List<DynamicPropertyInfo> _properties = new List<DynamicPropertyInfo>();
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private Type _superClass = null;
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/// <summary>
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/// 配置Class
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/// </summary>
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/// <param name="className">类名</param>
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/// <param name="attributes">类标记的特性[Table(Name = "xxx")] [Index(xxxx)]</param>
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/// <returns></returns>
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public DynamicCompileBuilder Class(string className, params Attribute[] attributes)
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{
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_className = className;
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_tableAttributes = attributes;
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return this;
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}
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/// <summary>
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/// 配置属性
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/// </summary>
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/// <param name="propertyName">属性名称</param>
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/// <param name="propertyType">属性类型</param>
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/// <param name="attributes">属性标记的特性-支持多个</param>
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/// <returns></returns>
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public DynamicCompileBuilder Property(string propertyName, Type propertyType, params Attribute[] attributes)
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{
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_properties.Add(new DynamicPropertyInfo()
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{
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PropertyName = propertyName,
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PropertyType = propertyType,
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Attributes = attributes
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});
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return this;
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}
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/// <summary>
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/// 配置父类
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/// </summary>
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/// <param name="superClass">父类类型</param>
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/// <returns></returns>
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public DynamicCompileBuilder SuperClass(Type superClass)
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{
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_superClass = superClass;
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return this;
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}
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private void SetTableAttribute(ref TypeBuilder typeBuilder)
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{
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if (_tableAttributes == null) return;
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foreach (var tableAttribute in _tableAttributes)
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{
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var propertyValues = new ArrayList();
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if (tableAttribute == null) continue;
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var classCtorInfo = tableAttribute.GetType().GetConstructor(new Type[] { });
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var propertyInfos = tableAttribute.GetType().GetProperties().Where(p => p.CanWrite == true).ToArray();
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foreach (var propertyInfo in propertyInfos)
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propertyValues.Add(propertyInfo.GetValue(tableAttribute));
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//可能存在有参构造
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if (classCtorInfo == null)
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{
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var constructorTypes = propertyInfos.Select(p => p.PropertyType);
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classCtorInfo = tableAttribute.GetType().GetConstructor(constructorTypes.ToArray());
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var customAttributeBuilder = new CustomAttributeBuilder(classCtorInfo, propertyValues.ToArray());
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typeBuilder.SetCustomAttribute(customAttributeBuilder);
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}
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else
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{
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var customAttributeBuilder = new CustomAttributeBuilder(classCtorInfo, new object[0], propertyInfos,
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propertyValues.ToArray());
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typeBuilder.SetCustomAttribute(customAttributeBuilder);
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}
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}
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}
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private void SetPropertys(ref TypeBuilder typeBuilder)
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{
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foreach (var pinfo in _properties)
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{
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if (pinfo == null)
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continue;
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var propertyName = pinfo.PropertyName;
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var propertyType = pinfo.PropertyType;
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//设置字段
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var field = typeBuilder.DefineField($"_{FirstCharToLower(propertyName)}", propertyType,
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FieldAttributes.Private);
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var firstCharToUpper = FirstCharToUpper(propertyName);
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//设置属性方法
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var methodGet = typeBuilder.DefineMethod($"Get{firstCharToUpper}", MethodAttributes.Public,
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propertyType, null);
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var methodSet = typeBuilder.DefineMethod($"Set{firstCharToUpper}", MethodAttributes.Public, null,
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new Type[] { propertyType });
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var ilOfGet = methodGet.GetILGenerator();
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ilOfGet.Emit(OpCodes.Ldarg_0);
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ilOfGet.Emit(OpCodes.Ldfld, field);
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ilOfGet.Emit(OpCodes.Ret);
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var ilOfSet = methodSet.GetILGenerator();
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ilOfSet.Emit(OpCodes.Ldarg_0);
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ilOfSet.Emit(OpCodes.Ldarg_1);
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ilOfSet.Emit(OpCodes.Stfld, field);
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ilOfSet.Emit(OpCodes.Ret);
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//设置属性
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var propertyBuilder =
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typeBuilder.DefineProperty(propertyName, PropertyAttributes.None, propertyType, null);
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propertyBuilder.SetGetMethod(methodGet);
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propertyBuilder.SetSetMethod(methodSet);
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foreach (var pinfoAttribute in pinfo.Attributes)
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{
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//设置特性
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SetPropertyAttribute(ref propertyBuilder, pinfoAttribute);
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}
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}
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}
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private void SetPropertyAttribute<T>(ref PropertyBuilder propertyBuilder, T tAttribute)
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{
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if (tAttribute == null) return;
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var propertyInfos = tAttribute.GetType().GetProperties().Where(p => p.CanWrite == true).ToArray();
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var constructor = tAttribute.GetType().GetConstructor(new Type[] { });
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var propertyValues = new ArrayList();
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foreach (var propertyInfo in propertyInfos)
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propertyValues.Add(propertyInfo.GetValue(tAttribute));
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var customAttributeBuilder =
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new CustomAttributeBuilder(constructor, new object[0], propertyInfos, propertyValues.ToArray());
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propertyBuilder.SetCustomAttribute(customAttributeBuilder);
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}
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/// <summary>
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/// Emit动态创建出Class - Type
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/// </summary>
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/// <returns></returns>
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public Type Build()
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{
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//初始化AssemblyName的一个实例
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var assemblyName = new AssemblyName("FreeSql.DynamicCompileBuilder");
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//设置程序集的名称
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var defineDynamicAssembly = AssemblyBuilder.DefineDynamicAssembly(assemblyName, AssemblyBuilderAccess.Run);
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//动态在程序集内创建一个模块
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var defineDynamicModule =
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defineDynamicAssembly.DefineDynamicModule("FreeSql.DynamicCompileBuilder.Dynamics");
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//动态的在模块内创建一个类
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var typeBuilder =
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defineDynamicModule.DefineType(_className, TypeAttributes.Public | TypeAttributes.Class, _superClass);
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//设置TableAttribute
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SetTableAttribute(ref typeBuilder);
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//设置属性
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SetPropertys(ref typeBuilder);
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//创建类的Type对象
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return typeBuilder.CreateType();
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}
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/// <summary>
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/// 首字母小写
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/// </summary>
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/// <param name="input"></param>
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/// <returns></returns>
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private string FirstCharToLower(string input)
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{
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if (string.IsNullOrEmpty(input))
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return input;
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string str = input.First().ToString().ToLower() + input.Substring(1);
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return str;
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}
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/// <summary>
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/// 首字母大写
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/// </summary>
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/// <param name="input"></param>
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/// <returns></returns>
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private string FirstCharToUpper(string input)
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{
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if (string.IsNullOrEmpty(input))
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return input;
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string str = input.First().ToString().ToUpper() + input.Substring(1);
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return str;
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}
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private static string Md5Encryption(string inputStr)
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{
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var result = string.Empty;
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//32位大写
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using (var md5 = MD5.Create())
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{
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var resultBytes = md5.ComputeHash(Encoding.UTF8.GetBytes(inputStr));
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result = BitConverter.ToString(resultBytes);
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}
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return result;
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}
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class DynamicPropertyInfo
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{
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public string PropertyName { get; set; } = string.Empty;
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public Type PropertyType { get; set; }
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public Attribute[] Attributes { get; set; }
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}
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}
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}
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@ -0,0 +1,74 @@
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using System;
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using System.Collections.Concurrent;
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using System.Collections.Generic;
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using System.Linq.Expressions;
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namespace FreeSql.Extensions.DynamicEntity
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{
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/// <summary>
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/// 动态创建对象帮助类
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/// </summary>
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public class DynamicCompileHelper
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{
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/// <summary>
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/// 动态构建Class - Type
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/// </summary>
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/// <returns></returns>
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public static DynamicCompileBuilder DynamicBuilder()
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{
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return new DynamicCompileBuilder();
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}
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/// <summary>
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/// 委托缓存
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/// </summary>
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private static readonly ConcurrentDictionary<string, Delegate>
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DelegateCache = new ConcurrentDictionary<string, Delegate>();
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/// <summary>
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/// 设置动态对象的属性值
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/// </summary>
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/// <param name="type"></param>
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/// <param name="porpertys"></param>
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/// <returns></returns>
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public static object CreateObjectByType(Type type, Dictionary<string, object> porpertys)
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{
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if (type == null)
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return null;
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object istance = Activator.CreateInstance(type);
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if (istance == null)
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return null;
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//根据key确定缓存
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var cacheKey = $"{type.GetHashCode()}{porpertys.GetHashCode()}";
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var dynamicDelegate = DelegateCache.GetOrAdd(cacheKey, key =>
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{
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//表达式目录树构建委托
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var typeParam = Expression.Parameter(type);
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var dicParamType = typeof(Dictionary<string, object>);
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var dicParam = Expression.Parameter(dicParamType);
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var exps = new List<Expression>();
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var tempRef = Expression.Variable(typeof(object));
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foreach (var pinfo in porpertys)
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{
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var propertyInfo = type.GetProperty(pinfo.Key);
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if (propertyInfo == null)
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continue;
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var propertyName = Expression.Constant(pinfo.Key, typeof(string));
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exps.Add(Expression.Call(dicParam, dicParamType.GetMethod("TryGetValue"), propertyName, tempRef));
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exps.Add(Expression.Assign(Expression.MakeMemberAccess(typeParam, propertyInfo),
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Expression.Convert(tempRef, propertyInfo.PropertyType)));
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exps.Add(Expression.Assign(tempRef, Expression.Default(typeof(object))));
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}
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var returnTarget = Expression.Label(type);
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exps.Add(Expression.Return(returnTarget, typeParam));
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exps.Add(Expression.Label(returnTarget, Expression.Default(type)));
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var block = Expression.Block(new[] { tempRef }, exps);
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var @delegate = Expression.Lambda(block, typeParam, dicParam).Compile();
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return @delegate;
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});
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var dynamicInvoke = dynamicDelegate.DynamicInvoke(istance, porpertys);
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return dynamicInvoke;
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}
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}
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}
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@ -0,0 +1,15 @@
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<Project Sdk="Microsoft.NET.Sdk">
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<PropertyGroup>
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<TargetFrameworks>netstandard2.1;net451;net45;</TargetFrameworks>
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<GenerateDocumentationFile>True</GenerateDocumentationFile>
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<DocumentationFile>FreeSql.Extensions.DynamicEntity.xml</DocumentationFile>
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</PropertyGroup>
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<ItemGroup>
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<None Update="FreeSql.Extensions.DynamicEntity.xml">
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<CopyToOutputDirectory>Always</CopyToOutputDirectory>
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</None>
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</ItemGroup>
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</Project>
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@ -0,0 +1,81 @@
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<?xml version="1.0"?>
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<doc>
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<assembly>
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<name>FreeSql.Extensions.DynamicEntity</name>
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</assembly>
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<members>
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<member name="T:FreeSql.DynamicCompileBuilder">
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<summary>
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动态创建实体类型
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</summary>
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</member>
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<member name="M:FreeSql.DynamicCompileBuilder.Class(System.String,System.Attribute[])">
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<summary>
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配置Class
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</summary>
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<param name="className">类名</param>
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<param name="attributes">类标记的特性[Table(Name = "xxx")] [Index(xxxx)]</param>
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<returns></returns>
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</member>
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<member name="M:FreeSql.DynamicCompileBuilder.Property(System.String,System.Type,System.Attribute[])">
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<summary>
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配置属性
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</summary>
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<param name="propertyName">属性名称</param>
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<param name="propertyType">属性类型</param>
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<param name="attributes">属性标记的特性-支持多个</param>
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<returns></returns>
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</member>
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<member name="M:FreeSql.DynamicCompileBuilder.SuperClass(System.Type)">
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<summary>
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配置父类
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</summary>
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<param name="superClass">父类类型</param>
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<returns></returns>
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</member>
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<member name="M:FreeSql.DynamicCompileBuilder.Build">
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<summary>
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Emit动态创建出Class - Type
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</summary>
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<returns></returns>
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</member>
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<member name="M:FreeSql.DynamicCompileBuilder.FirstCharToLower(System.String)">
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<summary>
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首字母小写
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</summary>
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<param name="input"></param>
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<returns></returns>
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</member>
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<member name="M:FreeSql.DynamicCompileBuilder.FirstCharToUpper(System.String)">
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<summary>
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首字母大写
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</summary>
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<param name="input"></param>
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<returns></returns>
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</member>
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<member name="T:FreeSql.Extensions.DynamicEntity.DynamicCompileHelper">
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<summary>
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动态创建对象帮助类
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</summary>
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</member>
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<member name="M:FreeSql.Extensions.DynamicEntity.DynamicCompileHelper.DynamicBuilder">
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<summary>
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动态构建Class - Type
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</summary>
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<returns></returns>
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</member>
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<member name="F:FreeSql.Extensions.DynamicEntity.DynamicCompileHelper.DelegateCache">
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<summary>
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委托缓存
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</summary>
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</member>
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<member name="M:FreeSql.Extensions.DynamicEntity.DynamicCompileHelper.CreateObjectByType(System.Type,System.Collections.Generic.Dictionary{System.String,System.Object})">
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<summary>
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设置动态对象的属性值
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</summary>
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<param name="type"></param>
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<param name="porpertys"></param>
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<returns></returns>
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</member>
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</members>
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</doc>
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