From 50ba957e27569a679a1dbfa9e1c613735eab46ba Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?=E6=95=AC=E6=B4=AA=E6=B3=A2?= Date: Fri, 11 Jun 2021 11:22:45 +0800 Subject: [PATCH] =?UTF-8?q?string.Concat=20=E8=BF=94=E5=9B=9E=20string.Emp?= =?UTF-8?q?ty?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- .../FreeSql.Provider.Dameng/DamengUtils.cs | 21 +++++++++++++++---- 1 file changed, 17 insertions(+), 4 deletions(-) diff --git a/Providers/FreeSql.Provider.Dameng/DamengUtils.cs b/Providers/FreeSql.Provider.Dameng/DamengUtils.cs index 930bb5c1..7376f7c4 100644 --- a/Providers/FreeSql.Provider.Dameng/DamengUtils.cs +++ b/Providers/FreeSql.Provider.Dameng/DamengUtils.cs @@ -23,14 +23,21 @@ namespace FreeSql.Dameng { case DmDbType.Bit: if (value == null) value = null; - else value = (bool) value == true ? 1 : 0; + else value = (bool)value == true ? 1 : 0; dbtype = DmDbType.Int32; break; - + case DmDbType.Char: case DmDbType.VarChar: case DmDbType.Text: - value = string.Concat(value); + if (value == null) + { + value = (string)null; + } + else + { + value = string.Concat(value); + } break; } var ret = new DmParameter { ParameterName = QuoteParamterName(parameterName), DmSqlType = dbtype, Value = value }; @@ -56,8 +63,14 @@ namespace FreeSql.Dameng case DmDbType.Char: case DmDbType.VarChar: case DmDbType.Text: - if(value != null) + if (value == null) + { + value = (string)null; + } + else + { value = string.Concat(value); + } break; } }