如何在C＃中使用开关箱

我在这里想要做的只是向用户显示一条消息：

您已成功创建您的帐户

然后将它们重定向到登录页面，如果他们输入正确的信息。

但是，我的问题是，如果用户放置了无效的用户名或无效的临时密码，它会显示一个空白的窗口警告框，然后将页面重定向到登录页面。

我只是想显示错误消息，如果他们把错误的信息，而不是重定向的页面，如果他们把正确的信息，然后它会显示成功的消息，并重定向到登录页面。

string message = string.Empty;

switch (userId)
{
    case -1:
        errLbl.Text = "The current temporary password you entered is invalid.nPlease re-enter your current temporary password.";
        break;
    case -2:
        errLbl.Text = "Username already exists. Please choose a different username";
        break;
    default:
        message = "You have successfully created your account.  You will now be redirected to the Login page.  Thanks.";
        break;
}

string url = "Login";
string script = "window.onload = function(){ alert('";
script += message;
script += "');";
script += "window.location = '";
script += url;
script += "'; }";
ClientScript.RegisterStartupScript(this.GetType(), "Redirect", script, true);

---

您需要确保仅在成功创建帐户的情况下注册脚本。 您始终注册脚本，因此始终显示警告框。

你为什么不把脚本和它的注册移动到switch case的默认块中。 这应该可以解决你的问题。

           string message = string.Empty;
           switch (userId)
           {
               case -1:
                   errLbl.Text = "The current temporary password you entered is invalid.nPlease re-enter your current temporary password.";
                   break;
               case -2:
                   errLbl.Text = "Username already exists. Please choose a different username";
                   break;
               default:
                   message = "You have successfully created your account.  You will now be redirected to the Login page.  Thanks.";
           string url = "Login";
           string script = "window.onload = function(){ alert('";
           script += message;
           script += "');";
           script += "window.location = '";
           script += url;
           script += "'; }";
           ClientScript.RegisterStartupScript(this.GetType(), "Redirect", script, true);

                   break;
           }

---

我猜你必须在-1和-2的情况下给消息分配一些字符串，否则你的消息将保持空白。

switch (userId)
{
    case -1:
      message = "The current temporary password you entered is invalid.nPlease re-enter your current temporary password.";
      break;
    case -2:
      message = "Username already exists. Please choose a different username";
      break;
    default:
      message = "You have successfully created your account.  You will now be redirected to the Login page.  Thanks.";
      break;
}

---

像这样尝试

string url = "Login";
string successScript="";
string message = string.Empty;
switch (userId)
{
    case -1:
        message = "The current temporary password you entered is invalid.nPlease re-enter your current temporary password.";
        errLbl.Text = "The current temporary password you entered is invalid.nPlease re-enter your current temporary password.";
        break;
    case -2:
        message = "Username already exists. Please choose a different username";
        errLbl.Text = "Username already exists. Please choose a different username";
        break;
    default:
        message = "You have successfully created your account.  You will now be redirected to the Login page.  Thanks.";
        successScript += "window.location = '";
        successScript += url;
        successScript += "'; }";                           
        break;
}
string script = "window.onload = function(){ alert('";
script += message;
script += "');";
script += successScript;

ClientScript.RegisterStartupScript(this.GetType(), "Redirect", script, true);

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