IValidator.ErrorMessage-Eigenschaft

Artikel
08/20/2007

Ruft bei der Implementierung durch eine Klasse den Text für die Fehlermeldung ab, die generiert wird, wenn die betreffende Bedingung nicht erfüllt ist, oder legt diesen fest.

Namespace: System.Web.UI
Assembly: System.Web (in system.web.dll)

Syntax

'Declaration
Property ErrorMessage As String
'Usage
Dim instance As IValidator
Dim value As String

value = instance.ErrorMessage

instance.ErrorMessage = value

string ErrorMessage { get; set; }

property String^ ErrorMessage {
    String^ get ();
    void set (String^ value);
}

/** @property */
String get_ErrorMessage ()

/** @property */
void set_ErrorMessage (String value)

function get ErrorMessage () : String

function set ErrorMessage (value : String)

Eigenschaftenwert

Die zu generierende Fehlermeldung.

Hinweise

Entwickler von Web Forms-Seite können in den öffnenden Tags eines Serversteuerelements für die Validierung deklarativ auf diese Eigenschaft zugreifen. Weitere Informationen finden Sie unter Syntax von Validierungs-Serversteuerelementen.

Beispiel

<HTML>
   <HEAD>
      <script language="VB" runat="server">

         Sub Button_Click(sender As [Object], e As EventArgs)
            ' Generating a random number.
            Dim rand_number As New Random()
            myCompareValidate.ValueToCompare = rand_number.Next(1, 10).ToString()

            ' Set the ErrorMessage.
            myCompareValidate.ErrorMessage = "Try Again!!"
            myCompareValidate.Validate()

            ' Check for Validity of control.
            If myCompareValidate.IsValid And myTextBox.Text <> "" Then
               labelOutput.Text = "You guessed correctly!!"
               labelOutput.ForeColor = System.Drawing.Color.Blue
            Else
               labelOutput.Text = "You guessed poorly"
               labelOutput.ForeColor = System.Drawing.Color.Black
            End If

            labelOutput.Text += "<br><br>" + "The number is: " + _
               myCompareValidate.ValueToCompare
         End Sub 'Button_Click

  </Script>
</HEAD>
    <body>
       <form runat="server" ID="myForm">
          <h3>IValidator Example demonstrating IsValid & ErrorMessage</h3>
          <h5>Guess!! a number between 1 and 10:</h5>
          <asp:TextBox id="myTextBox" runat="server" />
          <asp:CompareValidator id="myCompareValidate"
               ControlToValidate="myTextBox" ValueToCompare="0"
               EnableClientScript="False" Type="Integer" Text="*"
               runat="server" />
          <br>
          <asp:Button Text="Submit" OnClick="Button_Click" runat="server" />
          <br>
          <asp:Label id="labelOutput" runat="server" />
          <br>
          <asp:ValidationSummary id="Summary1" runat="server" />
       </form>
    </body>
</HTML>

<HTML>
  <HEAD>
    <script language="C#" runat="server">

     void Button_Click(Object sender, EventArgs e)
     {
        // Generating the random number.
        Random rand_number = new Random();
        myCompareValidate.ValueToCompare = rand_number.Next(1, 10).ToString();

        // Setting the ErrorMessage.
        myCompareValidate.ErrorMessage="Try Again!!";
        myCompareValidate.Validate();

        // Check for Validity of control.
        if ((myCompareValidate.IsValid) && (myTextBox.Text != ""))
        {
           labelOutput.Text = "You guessed correctly!!";
           labelOutput.ForeColor = System.Drawing.Color.Blue;
        }
        else
        {
           labelOutput.Text =  "You guessed poorly";
           labelOutput.ForeColor = System.Drawing.Color.Black;
        }

        labelOutput.Text += "<br><br>" + "The number is: " +
           myCompareValidate.ValueToCompare;
     }

  </script>
</HEAD>
    <body>
      <form runat="server" ID="myForm">
        <h3>IValidator Example demonstrating IsValid & ErrorMessage</h3>
        <h5>Guess!! a number between 1 and 10 :</h5>
        <asp:TextBox id="myTextBox" runat="server" />
        <asp:CompareValidator id="myCompareValidate"
             ControlToValidate="myTextBox" ValueToCompare="0"
             EnableClientScript="False" Type="Integer" Text="*"
             runat="server" />
        <br>
        <asp:Button Text="Submit" OnClick="Button_Click" runat="server" />
        <br>
        <asp:Label id="labelOutput" runat="server" />
        <br>
        <asp:ValidationSummary id="Summary1" runat="server" />
     </form>
  </body>
</HTML>

<HTML>
  <HEAD>
    <script language="VJ#" runat="server">

    void Button_Click(Object sender, EventArgs e)
    {
        // Generating the random number.
        Random randNumber = new Random();
        myCompareValidate.set_ValueToCompare(
            System.Convert.ToString(randNumber.Next(1, 10)));

        // Setting the ErrorMessage.
        myCompareValidate.set_ErrorMessage("Try Again!!");
        myCompareValidate.Validate();

        // Check for Validity of control.
        if (myCompareValidate.get_IsValid() 
            && (!(myTextBox.get_Text().Equals("")))) {
            labelOutput.set_Text("You guessed correctly!!");
            labelOutput.set_ForeColor(System.Drawing.Color.get_Blue());
        }
        else {
            labelOutput.set_Text("You guessed poorly");
            labelOutput.set_ForeColor(System.Drawing.Color.get_Black());
        }
        labelOutput.set_Text(labelOutput.get_Text() + "<br><br>" 
            + "The number is: " + myCompareValidate.get_ValueToCompare());
    } //Button_Click

  </script>
</HEAD>
    <body>
      <form runat="server" ID="myForm">
        <h3>IValidator Example demonstrating IsValid & ErrorMessage</h3>
        <h5>Guess!! a number between 1 and 10 :</h5>
        <asp:TextBox id="myTextBox" runat="server" />
        <asp:CompareValidator id="myCompareValidate"
             ControlToValidate="myTextBox" ValueToCompare="0"
             EnableClientScript="False" Type="Integer" Text="*"
             runat="server" />
        <br>
        <asp:Button ID="Button1" Text="Submit" OnClick="Button_Click" runat="server" />
        <br>
        <asp:Label id="labelOutput" runat="server" />
        <br>
        <asp:ValidationSummary id="Summary1" runat="server" />
     </form>
  </body>
</HTML>

Plattformen

Windows 98, Windows 2000 SP4, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

.NET Framework unterstützt nicht alle Versionen sämtlicher Plattformen. Eine Liste der unterstützten Versionen finden Sie unter Systemanforderungen.

Versionsinformationen

.NET Framework

Unterstützt in: 2.0, 1.1, 1.0

Siehe auch

Referenz

IValidator-Schnittstelle
IValidator-Member
System.Web.UI-Namespace
BaseValidator

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