文本框asp.net回发在自动回发上触发两次 [英] Textbox asp.net postback trigger twice on autopostback true

问题描述

在文本框OnTextChanged事件上，回发周期触发两次。两种方法的断点都可以理解问题。
这是我的代码示例

On textbox OnTextChanged event the postback cycle triggering twice. Breakpoints on both methods to understand the issue. Here is my code sample

<form id="form1" runat="server">
    <div>
        <asp:TextBox runat="server" ID="TextBox1" OnTextChanged="TextBox1_TextChanged" AutoPostBack="true" />
    </div>
    <asp:Label ID="Label1" runat="server"></asp:Label>
</form>

其代码落后。

     public static int cycle { get; set; }
     protected void Page_Load(object sender, EventArgs e)
     {

     }
     protected void TextBox1_TextChanged(object sender, EventArgs e)
     {
        cycle++;
        Label1.Text = cycle.ToString(); 
     }

推荐答案

避免使用AUTOPOSTBACK，请保持OnTextChanged事件陷阱
并添加一个按钮（是否隐藏）以捕获文本框
上的返回压力以产生POSTBACK。

Avoid using AUTOPOSTBACK, keep the OnTextChanged event trap and add a button (hidden or not) to catch the return pression on the textbox to produce the POSTBACK.

这里是一个例子

        <asp:Panel runat="server" CssClass="col-md-2">
            <asp:Panel runat="server" CssClass="form-group input-group" DefaultButton="BTN_Cerca">
                <span class="input-group-btn">
                    <asp:Button runat="server" ID="BTN_Cerca" Text="Codice" CssClass="btn btn-secondary" ToolTip="Cerca in magazzino"/>
                </span>
                <asp:TextBox runat="server" ID="TXT_Search" CssClass="form-control" placeholder="Numero Articolo" OnTextChanged="TXT_Search_TextChanged" />
            </asp:Panel>
        </asp:Panel>

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