-

SqlServerTest/UnitTest/ExpressionTest/Method.cs

@@ -26,6 +26,7 @@ namespace OrmTest.UnitTest
                 ConvetToString();
                 ExtendToString();
                 ExtendSubstring();
+                ExtendDate();
 
                 //SqlFun methods
                 IIF();
@@ -222,6 +223,18 @@ namespace OrmTest.UnitTest
                 new SugarParameter("@MethodConst0","2015-1-1"),new SugarParameter("@Const1",x2)
             }, "ToDate error");
         }
+        private void ExtendDate()
+        {
+            var x2 = DateTime.Now;
+            Expression<Func<Student, bool>> exp = it => Convert.ToDateTime("2015-1-1") == x2;
+            SqlServerExpressionContext expContext = new SqlServerExpressionContext();
+            expContext.Resolve(exp, ResolveExpressType.WhereSingle);
+            var value = expContext.Result.GetString();
+            var pars = expContext.Parameters;
+            base.Check(value, pars, "(CAST(@MethodConst0 AS DATETIME) = @Const1 )", new List<SugarParameter>() {
+                new SugarParameter("@MethodConst0","2015-1-1"),new SugarParameter("@Const1",x2)
+            }, "ExtendDate error");
+        }
         
         private void ToInt64()
         {

SqlSugar/ExpressionsToSql/ResolveItems/MethodCallExpressionResolve.cs

@@ -13,16 +13,11 @@ namespace SqlSugar
         {
             var express = base.Expression as MethodCallExpression;
             var isLeft = parameter.IsLeft;
-            var isValidNativeMethod =
-                express.Method.Name.IsIn(
-                               "ToString", "ToInt32", "ToInt64", 
-                               "Length", "Replace", "Substring",
-                               "Contains", "EndsWith", "StartsWith",
-                               "HasValue", "Trim", "Equals",
-                               "ToLower", "ToUpper"); 
+            string methodName = express.Method.Name;
+            var isValidNativeMethod = MethodMapping.ContainsKey(methodName)&&express.Method.DeclaringType.Namespace==("System");
             if (isValidNativeMethod)
             {
-                NativeExtensionMethod(parameter, express, isLeft);
+                NativeExtensionMethod(parameter, express, isLeft, MethodMapping[methodName]);
             }
             else
             {
@@ -56,10 +51,9 @@ namespace SqlSugar
             }
         }
 
-        private void NativeExtensionMethod(ExpressionParameter parameter, MethodCallExpression express, bool? isLeft)
+        private void NativeExtensionMethod(ExpressionParameter parameter, MethodCallExpression express, bool? isLeft,string name)
         {
             var method = express.Method;
-            string name = method.Name;
             var args = express.Arguments.Cast<Expression>().ToList();
             MethodCallExpressionModel model = new MethodCallExpressionModel();
             model.Args = new List<MethodCallExpressionArgs>();
@@ -234,6 +228,28 @@ namespace SqlSugar
             return null;
         }
 
+        private static Dictionary<string, string> MethodMapping = new Dictionary<string, string>() {
+            { "ToString","ToString"},
+            { "ToInt32","ToInt32"},
+            { "ToInt16","ToInt32"},
+            { "ToInt64","ToInt64"},
+            { "ToDecimal","ToDecimal"},
+            { "ToDateTime","ToDate"},
+            { "ToBoolean","ToBool"},
+            { "ToDouble","ToDouble"},
+            { "Length","Length"},
+            { "Replace","Replace"},
+            { "Contains","Contains"},
+            { "EndsWith","EndsWith"},
+            { "StartsWith","StartsWith"},
+            { "HasValue","HasValue"},
+            { "Trim","Trim"},
+            { "Equals","Equals"},
+            { "ToLower","ToLower"},
+            { "ToUpper","ToUpper"},
+            { "Substring","Substring"}
+        };
+
         private void CheckMethod(MethodCallExpression expression)
         {
             Check.Exception(expression.Method.ReflectedType.FullName != ExpressionConst.SqlFuncFullName, ExpressionErrorMessage.MethodError);