如何处理从SQL抛出的错误消息到controller.cs

Question

I want to check for duplicate username is exist or not. 我想检查是否存在重复的用户名。

In my AddNewUser stored procedure 在我的AddNewUser存储过程中

I have used following code 我使用了以下代码

DECALRE @error nvarchar(500)
IF EXISTS(SELECT EMAIL FROM [USERSTABLE] WHERE Email= @Email)  
set @error = 'User already exists with email address '+@Email
RAISERROR (@error,16,1);

Now I want to catch this error message on UserNameController.cs 现在，我想在UserNameController.cs上捕获此错误消息

try
{
 using (SqlConnection connection = new SqlConnection(connectionString))
                {
                    connection.Open();
                    using (SqlCommand cmd = new SqlCommand("sp_CreateNewUser", connection))
                    {
                        cmd.CommandType = CommandType.StoredProcedure;

            //some parameters
            cmd.ExecuteScalar();
}

catch(Exception ex)
{throw ex;}

Now in ex I'm getting that error message. 现在在ex我收到该错误消息。 But how to show it on View? 但是如何在View上显示呢？ (.cshtml)? （.cshtml）？

Answer 1

What about storing 'ex' in a ViewBag / TempData and then displaying it in View. 将'ex'存储在ViewBag / TempData ，然后在View中显示该ViewBag / TempData ？

PS: Pardon me if I am wrong, I don't have much knowledge on MVC. PS：请原谅我，如果我做错了，我对MVC知识不多。

Answer 2

One of the possible solutions would be to enable custom errors in web.config: 一种可能的解决方案是在web.config中启用自定义错误：

<system.web>
    <customErrors mode="On" />
</system.web>

Once that is done, create a new view named Error.cshtml in Views/Shared: 完成后，在Views / Shared中创建一个名为Error.cshtml的新视图：

@model System.Web.Mvc.HandleErrorInfo

<!DOCTYPE html>
<html>
<head>
    <title>Error</title>
</head>
<body>
    <h2>
        Sorry, an error occurred while processing your request.
    </h2>
    <p>Controller Name: @Model.ControllerName</p>
    <p>Action Name : @Model.ActionName</p>
    <p>Message: @Model.Exception.Message</p>
</body>
</html>
</html>

Now you will see exception message in this custom view when exception is thrown. 现在，当引发异常时，您将在此自定义视图中看到异常消息。 No need to catch it manually. 无需手动捕获。

Answer 3

On the View you need to create control to show the message about error - usually it will be clean or unvisible. 在View您需要创建控件以显示有关错误的消息-通常它将是干净的或不可见的。 If you got an error - put your message abot error in this control and make it visible. 如果遇到错误，请在此控件中添加错误信息，使其可见。

Change your code here 在这里更改代码

catch(Exception ex)
{/*there must be code to show message*/}

如何处理从SQL抛出的错误消息到controller.cs

问题描述

3 个解决方案

解决方案1
1 2014-02-27 08:32:53

解决方案2
0 2014-02-27 08:39:50

解决方案3
0 已采纳 2014-02-27 08:41:54

如何处理从SQL抛出的错误消息到controller.cs

问题描述

3 个解决方案

解决方案1 1 2014-02-27 08:32:53

解决方案2 0 2014-02-27 08:39:50

解决方案3 0 已采纳 2014-02-27 08:41:54

解决方案1
1 2014-02-27 08:32:53

解决方案2
0 2014-02-27 08:39:50

解决方案3
0 已采纳 2014-02-27 08:41:54