ASP.NET没有从LinkBut​​ton onClick（VB）获得CommandArgument值

Question

我需要从LinkBut​​ton的commandArgument中获取值，但是当我将鼠标悬停在字母B上时，例如，我发现我得到的是此字母而非单独的字母：

这些是它的代码：

'problem here with the commandArgument 
    Sub LetterGuessed(sender As Object, e As CommandEventArgs) 
     'First, make the letter selected disabled 

     Dim clickedButton As LinkButton = e.CommandArgument 
     clickedButton.Enabled = False 
     clickedButton.ForeColor = Color.Red 

     'Now, determine if the letter is in the word 
     If Session("hangman_word").ToString().ToLower().IndexOf(e.CommandArgument.ToLower()) >= 0 Then 
      'The letter was found 
      Dim i As Integer 
      Dim current As String = String.Empty 
      For i = 0 To Session("hangman_word").ToString().Length - 1 
       If Session("hangman_word").ToString().Substring(i, 1).ToLower() = e.CommandArgument.ToLower() Then 
        current &= Session("hangman_word").ToString().Substring(i, 1) 
       Else 
        current &= Session("current_word").ToString().Substring(i, 1) 
       End If 
      Next i 

      Session("current_word") = current 
      DisplayCurrentWord() 

      'See if they have guessed the word correctly! 
      If Session("hangman_word").ToString() = Session("current_word").ToString() Then 
       EndGame(True) 
      End If 
     Else 
      'The letter was not found, increment the # of wrong guesses 
      Session("wrong_guesses") = Convert.ToInt32(Session("wrong_guesses")) + 1 

      'Update the hangman image 
      hangmanImage.ImageUrl = "Content/hangman/hang_" & Session("wrong_guesses").ToString() & ".gif" 

      If Convert.ToInt32(Session("wrong_guesses")) >= 6 Then 
       'Eep, the person has lost 
       EndGame(False) 
      End If 
     End If 
    End Sub 

这是形式：

<form> 
    <asp:image id="hangmanImage" runat="server" /> 
    <p> 

    <asp:literal runat="server" id="currentWord" /> 
    <p> 
    <asp:LinkButton runat="server" id="A" CommandArgument="A" Text="A" OnCommand="LetterGuessed" /> | 
    <asp:LinkButton runat="server" id="B" CommandArgument="B" Text="B" OnCommand="LetterGuessed" /> | 
    <asp:LinkButton runat="server" id="C" CommandArgument="C" Text="C" OnCommand="LetterGuessed" /> | 
    <asp:LinkButton runat="server" id="D" CommandArgument="D" Text="D" OnCommand="LetterGuessed" /> | 
    <asp:LinkButton runat="server" id="E" CommandArgument="E" Text="E" OnCommand="LetterGuessed" /> | 
    <asp:LinkButton runat="server" id="F" CommandArgument="F" Text="F" OnCommand="LetterGuessed" /> | 
    <asp:LinkButton runat="server" id="G" CommandArgument="G" Text="G" OnCommand="LetterGuessed" /> | 
    <asp:LinkButton runat="server" id="H" CommandArgument="H" Text="H" OnCommand="LetterGuessed" /> | 
    <asp:LinkButton runat="server" id="I" CommandArgument="I" Text="I" OnCommand="LetterGuessed" /> | 
    <asp:LinkButton runat="server" id="J" CommandArgument="J" Text="J" OnCommand="LetterGuessed" /> | 
    <asp:LinkButton runat="server" id="K" CommandArgument="K" Text="K" OnCommand="LetterGuessed" /> | 
    <asp:LinkButton runat="server" id="L" CommandArgument="L" Text="L" OnCommand="LetterGuessed" /> | 
    <asp:LinkButton runat="server" id="M" CommandArgument="M" Text="M" OnCommand="LetterGuessed" /> | 
    <asp:LinkButton runat="server" id="N" CommandArgument="N" Text="N" OnCommand="LetterGuessed" /> | 
    <asp:LinkButton runat="server" id="O" CommandArgument="O" Text="O" OnCommand="LetterGuessed" /> | 
    <asp:LinkButton runat="server" id="P" CommandArgument="P" Text="P" OnCommand="LetterGuessed" /> | 
    <asp:LinkButton runat="server" id="Q" CommandArgument="Q" Text="Q" OnCommand="LetterGuessed" /> | 
    <asp:LinkButton runat="server" id="R" CommandArgument="R" Text="R" OnCommand="LetterGuessed" /> | 
    <asp:LinkButton runat="server" id="S" CommandArgument="S" Text="S" OnCommand="LetterGuessed" /> | 
    <asp:LinkButton runat="server" id="T" CommandArgument="T" Text="T" OnCommand="LetterGuessed" /> | 
    <asp:LinkButton runat="server" id="U" CommandArgument="U" Text="U" OnCommand="LetterGuessed" /> | 
    <asp:LinkButton runat="server" id="V" CommandArgument="V" Text="V" OnCommand="LetterGuessed" /> | 
    <asp:LinkButton runat="server" id="W" CommandArgument="W" Text="W" OnCommand="LetterGuessed" /> | 
    <asp:LinkButton runat="server" id="X" CommandArgument="X" Text="X" OnCommand="LetterGuessed" /> | 
    <asp:LinkButton runat="server" id="Y" CommandArgument="Y" Text="Y" OnCommand="LetterGuessed" /> | 
    <asp:LinkButton runat="server" id="Z" CommandArgument="Z" Text="Z" OnCommand="LetterGuessed" /> 
    <p> 
    <center> 
     <asp:label id="lblEndGameMessage" runat="server" 
      Font-Size="18pt" Font-Weight="Bold" /> 
    </center> 
</form> 

这是页面： http://asptry20160424112507.azurewebsites.net/

有人可以帮我吗？

Answer 1

您可以检索LinkBut​​ton控件及其CommandArgument这样：

Protected Sub LetterGuessed(object sender, CommandEventArgs e) 
    Dim clickedButton As LinkButton = CType(sender, LinkButton) 
    Dim cmdArgument As String = e.CommandArgument 
    ... 
End Sub