TextBox.MaxLength屬性．

最後更新：2018-12-07 來源：互聯網

上載者：User

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最近留戀於Csdn社區，發現很多網友問一些關於TextBox的MaxLength屬性的問題．現將SDK說明列於此，
TextBox.MaxLength 屬性
擷取或設定文字框中最多允許的字元數
文字框中最多允許的字元數。預設值為 0，表示未設定該屬性。
使用 MaxLength 屬性限定可以在 TextBox 控制項中輸入的字元數。

注意 :僅當 TextMode 屬性設定為 TextBoxMode.SingleLine 或 TextBoxMode.Password 時，此屬性才適用。
<%@ Page Language="C#" AutoEventWireup="True" %>
<html>
<head>
<script runat="server">

      protected void AddButton_Click(Object sender, EventArgs e)
      {
         int Answer;

Answer = Convert.ToInt32(Value1.Text) + Convert.ToInt32(Value2.Text);

AnswerMessage.Text = Answer.ToString();

}

</script>

</head>
<body>
   <form runat="server">
      <h3> TextBox Example </h3>
      <table>
         <tr>
            <td colspan="5">
               Enter integer values into the text boxes. <br/>
               Click the Add button to add the two values. <br/>
               Click the Reset button to reset the text boxes.
            </td>
         </tr>
         <tr>
            <td colspan="5">
                
            </td>
         </tr>
         <tr align="center">
            <td>
               <asp:TextBox ID="Value1"
                    Columns="2"
                    MaxLength="3"
                    Text="1"
                    runat="server"/>
            </td>
            <td>
               +
            </td>
            <td>
               <asp:TextBox ID="Value2"
                    Columns="2"
                    MaxLength="3"
                    Text="1"
                    runat="server"/>
            </td>
            <td>
               =
            </td>
            <td>
               <asp:Label ID="AnswerMessage"
                    runat="server"/>
            </td>
        </tr>
        <tr>

               <asp:RequiredFieldValidator
                    ID="Value1RequiredValidator"
                    ControlToValidate="Value1"
                    ErrorMessage="Please enter a value.<br/>"
                    Display="Dynamic"
                    runat="server"/>

               <asp:RangeValidator
                    ID="Value1RangeValidator"
                    ControlToValidate="Value1"
                    Type="Integer"
                    MinimumValue="1"
                    MaximumValue="100"
                    ErrorMessage="Please enter an integer <br/> between than 1 and 100.<br/>"
                    Display="Dynamic"
                    runat="server"/>

</td>

               <asp:RequiredFieldValidator
                    ID="Value2RequiredValidator"
                    ControlToValidate="Value2"
                    ErrorMessage="Please enter a value.<br/>"
                    Display="Dynamic"
                    runat="server"/>

               <asp:RangeValidator
                    ID="Value2RangeValidator"
                    ControlToValidate="Value2"
                    Type="Integer"
                    MinimumValue="1"
                    MaximumValue="100"
                    ErrorMessage="Please enter an integer <br/> between than 1 and 100.<br/>"
                    Display="Dynamic"
                    runat="server"/>

</td>

<td>

&nbsp

</td

</tr>

               <asp:Button ID="AddButton"
                    Text="Add"
                    OnClick="AddButton_Click"
                    runat="server"/>
            </td>
            <td>
                
            </td>
         </tr>
      </table>
   </form>
</body>
</html>
樣本展示如何使用 MaxLength 屬性將 TextBox 控制項允許的字元數限定為 3。

本文章原先以中文撰寫並發佈於 aliyun.com，亦設英文版本，僅作資訊用途。本網站不對文章的準確性，完整性或可靠性或其任何翻譯作出任何明示或暗示的陳述或保證。如對該文章有任何疑慮或投訴，請傳送電郵至 info-contact@alibabacloud.com 並提供相關疑慮或投訴的詳細說明。職員會於 5 個工作天內與您聯絡，一經驗證之後，即會刪除該侵權內容。

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TextBox.MaxLength屬性．

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