diff --git a/Src/Asp.Net/SqlSugar/Abstract/DbFirstProvider/DbFirstProvider.cs b/Src/Asp.Net/SqlSugar/Abstract/DbFirstProvider/DbFirstProvider.cs
index 8b95fa42d..a00a518f1 100644
--- a/Src/Asp.Net/SqlSugar/Abstract/DbFirstProvider/DbFirstProvider.cs
+++ b/Src/Asp.Net/SqlSugar/Abstract/DbFirstProvider/DbFirstProvider.cs
@@ -472,7 +472,7 @@ namespace SqlSugar
             PropertyText = PropertyText.Replace(DbFirstTemplate.KeyPropertyName, propertyName);
             if (typeString == "string"&&this.IsStringNullable&&item.IsNullable==false&&PropertyText.EndsWith("{get;set;}\r\n")) 
             {
-                PropertyText=PropertyText.Replace("{get;set;}\r\n", "{get;set;} = string.Empty;\r\n");
+                PropertyText=PropertyText.Replace("{get;set;}\r\n", "{get;set;} = null!;\r\n");
             }
             return PropertyText;
         }