-

Src/Asp.Net/SqlSugar/ExpressionsToSql/CaseWhen/CaseWhenResolve.cs

@@ -16,10 +16,13 @@ namespace SqlSugar
             this.context = context;
             var currentExpression = expression;
             allMethods.Add(currentExpression);
-            if (context.IsSingle && oppsiteExpression != null&& oppsiteExpression is MemberExpression)
+            if (context.IsSingle && oppsiteExpression != null && oppsiteExpression is MemberExpression)
             {
                 var childExpression = (oppsiteExpression as MemberExpression).Expression;
-                this.context.SingleTableNameSubqueryShortName = (childExpression as ParameterExpression).Name;
+                if ((childExpression as ParameterExpression) != null)
+                {
+                    this.context.SingleTableNameSubqueryShortName = (childExpression as ParameterExpression).Name;
+                }
             }
             else if (context.IsSingle)
             {
@@ -41,11 +44,11 @@ namespace SqlSugar
             foreach (var methodExp in allMethods)
             {
                 var isFirst = allMethods.First() == methodExp;
-                var isLast= allMethods.Last() == methodExp;
-                var sql= SubTools.GetMethodValue(this.context, methodExp.Arguments[0],this.context.IsSingle?ResolveExpressType.WhereSingle:ResolveExpressType.WhereMultiple);
+                var isLast = allMethods.Last() == methodExp;
+                var sql = SubTools.GetMethodValue(this.context, methodExp.Arguments[0], this.context.IsSingle ? ResolveExpressType.WhereSingle : ResolveExpressType.WhereMultiple);
                 sqls.Add(new KeyValuePair<string, string>(methodExp.Method.Name, sql));
             }
-            var result= this.context.DbMehtods.CaseWhen(sqls);
+            var result = this.context.DbMehtods.CaseWhen(sqls);
             return result;
         }
     }