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- 增加 IEnumerable<TEntity> 扩展方法 AsSelect

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This commit is contained in:
28810
2019-03-15 15:03:08 +08:00
parent fccc3fc8b9
commit 23d5d33bdd
8 changed files with 139 additions and 8 deletions
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16
FreeSql/Extensions/FreeSqlGlobalExtensions.cs
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@ -1,4 +1,5 @@
using System;
using FreeSql;
using System;
using System.Collections.Concurrent;
using System.Collections.Generic;
using System.ComponentModel;
@ -73,4 +74,17 @@ public static class FreeSqlGlobalExtensions {
}
return ret;
}
/// <summary>
/// 将 IEnumable<T> 转成 ISelect<T>，以便使用 FreeSql 的查询功能。此方法用于 Lambad 表达式中，快速进行集合导航的查询。
/// </summary>
/// <typeparam name="TEntity"></typeparam>
/// <param name="that"></param>
/// <returns></returns>
public static ISelect<TEntity> AsSelect<TEntity>(this IEnumerable<TEntity> that) where TEntity : class {
throw new NotImplementedException();
}
public static ISelect<TEntity> AsSelect<TEntity>(this IEnumerable<TEntity> that, IFreeSql orm = null) where TEntity : class {
return orm?.Select<TEntity>();
}
}

29
FreeSql/Internal/CommonExpression.cs
View File

@ -1,5 +1,6 @@
using FreeSql.Internal.Model;
using System;
using System.Collections;
using System.Collections.Generic;
using System.Data.Common;
using System.Linq;
@ -236,12 +237,18 @@ namespace FreeSql.Internal {
}
if (callType.FullName.StartsWith("FreeSql.ISelect`")) { //子表查询
if (exp3.Method.Name == "Any") { //exists
var anyArgs = exp3.Arguments;
var exp3Stack = new Stack<Expression>();
var exp3tmp = exp3.Object;
if (exp3tmp != null && anyArgs.Any())
exp3Stack.Push(Expression.Call(exp3tmp, callType.GetMethod("Where", anyArgs.Select(a => a.Type).ToArray()), anyArgs.ToArray()));
while (exp3tmp != null) {
exp3Stack.Push(exp3tmp);
switch (exp3tmp.NodeType) {
case ExpressionType.Call: exp3tmp = (exp3tmp as MethodCallExpression).Object; continue;
case ExpressionType.Call:
var exp3tmpCall = (exp3tmp as MethodCallExpression);
exp3tmp = exp3tmpCall.Object == null ? exp3tmpCall.Arguments.FirstOrDefault() : exp3tmpCall.Object;
continue;
case ExpressionType.MemberAccess: exp3tmp = (exp3tmp as MemberExpression).Expression; continue;
}
break;
@ -253,7 +260,19 @@ namespace FreeSql.Internal {
while (exp3Stack.Any()) {
exp3tmp = exp3Stack.Pop();
if (exp3tmp.Type.FullName.StartsWith("FreeSql.ISelect`") && fsql == null) {
fsql = Expression.Lambda(exp3tmp).Compile().DynamicInvoke();
if (exp3tmp.NodeType == ExpressionType.Call) {
var exp3tmpCall = (exp3tmp as MethodCallExpression);
if (exp3tmpCall.Method.Name == "AsSelect" && exp3tmpCall.Object == null) {
var exp3tmpArg1Type = exp3tmpCall.Arguments.FirstOrDefault()?.Type;
if (exp3tmpArg1Type != null) {
var exp3tmpEleType = exp3tmpArg1Type.GetElementType() ?? exp3tmpArg1Type.GenericTypeArguments.FirstOrDefault();
if (exp3tmpEleType != null) {
fsql = typeof(IFreeSql).GetMethod("Select", new Type[0]).MakeGenericMethod(exp3tmpEleType).Invoke(_common._orm, null);
}
}
}
}
if (fsql == null) fsql = Expression.Lambda(exp3tmp).Compile().DynamicInvoke();
fsqlType = fsql?.GetType();
if (fsqlType == null) break;
fsqlType.GetField("_limit", BindingFlags.Instance | BindingFlags.NonPublic).SetValue(fsql, 1);
@ -295,6 +314,12 @@ namespace FreeSql.Internal {
}
}
}
var eleType = callType.GetElementType() ?? callType.GenericTypeArguments.FirstOrDefault();
if (eleType != null && typeof(IEnumerable<>).MakeGenericType(eleType).IsAssignableFrom(callType)) { //集合导航属性子查询
if (exp3.Method.Name == "Any") { //exists
}
}
var other3Exp = ExpressionLambdaToSqlOther(exp3, _tables, _selectColumnMap, getSelectGroupingMapString, tbtype, isQuoteName);
if (string.IsNullOrEmpty(other3Exp) == false) return other3Exp;
throw new Exception($"未实现函数表达式 {exp3} 解析");