diff --git a/Src/Asp.Net/SqlSugar/ExpressionsToSql/ResolveItems/BaseResolve.cs b/Src/Asp.Net/SqlSugar/ExpressionsToSql/ResolveItems/BaseResolve.cs
index 0133e1026..cc7963f81 100644
--- a/Src/Asp.Net/SqlSugar/ExpressionsToSql/ResolveItems/BaseResolve.cs
+++ b/Src/Asp.Net/SqlSugar/ExpressionsToSql/ResolveItems/BaseResolve.cs
@@ -54,7 +54,7 @@ namespace SqlSugar
             }
             else if (expression is ConditionalExpression)
             {
-                Check.ThrowNotSupportedException("ConditionalExpression");
+                return new ConditionalExpressionResolve(parameter);
             }
             else if (expression is MethodCallExpression)
             {
diff --git a/Src/Asp.Net/SqlSugar/ExpressionsToSql/ResolveItems/ConditionalExpressionResolve.cs b/Src/Asp.Net/SqlSugar/ExpressionsToSql/ResolveItems/ConditionalExpressionResolve.cs
index 4f1719e2a..85e81bca6 100644
--- a/Src/Asp.Net/SqlSugar/ExpressionsToSql/ResolveItems/ConditionalExpressionResolve.cs
+++ b/Src/Asp.Net/SqlSugar/ExpressionsToSql/ResolveItems/ConditionalExpressionResolve.cs
@@ -9,7 +9,25 @@ namespace SqlSugar
     {
         public ConditionalExpressionResolve(ExpressionParameter parameter) : base(parameter)
         {
-
+            var express = base.Expression as ConditionalExpression;
+            var isLeft = parameter.IsLeft;
+            switch (base.Context.ResolveType)
+            {
+                case ResolveExpressType.None:
+                case ResolveExpressType.WhereSingle:
+                case ResolveExpressType.WhereMultiple:
+                case ResolveExpressType.SelectSingle:
+                case ResolveExpressType.SelectMultiple:
+                case ResolveExpressType.FieldSingle:
+                case ResolveExpressType.FieldMultiple:
+                case ResolveExpressType.Join:
+                case ResolveExpressType.ArraySingle:
+                case ResolveExpressType.ArrayMultiple:
+                case ResolveExpressType.Update:
+                default:
+                    Check.Exception(true, "Does not support it.xx==value ? true:false , Use SqlFunc.IIF (it.xx==value,true,false)");
+                    break;
+            }
         }
     }
 }
diff --git a/Src/Asp.Net/SqlSugar/SqlSugar.nuspec b/Src/Asp.Net/SqlSugar/SqlSugar.nuspec
index 9c3089a1a..72e79cac1 100644
--- a/Src/Asp.Net/SqlSugar/SqlSugar.nuspec
+++ b/Src/Asp.Net/SqlSugar/SqlSugar.nuspec
@@ -2,7 +2,7 @@
 <package >
   <metadata>
     <id>sqlSugar</id>
-    <version>4.5.1.7</version>
+    <version>4.5.1.8</version>
     <title>SqlSugar .Net Framework 4.0+  ORM </title>
     <authors>sun kaixuan</authors>
     <owners>landa</owners>