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使用TextBox的Usercontrol操作事件

[英]Usercontrol action event with TextBox

我是asp.net的新手,我的問題是我在default.aspx中有一個TextBox和用戶控件Button,單擊Button之后,我需要更改TextBox的文本值(用戶控件中的某些默認值)。

如果可以的話,我需要在哪里編寫代碼?

Default.aspx的

<%@ Register Src="Text.ascx" TagName="Edit" TagPrefix="uc1" %> 
<asp:TextBox ID="TextBox1" runat="server" Width="262px"></asp:TextBox>
<uc1:Edit Id="Edit2" runat="server" /></td>

用戶控件-按鈕

<%@ Control Language="C#" AutoEventWireup="true" CodeBehind="Text.ascx.cs" Inherits="WebApplication4.WebUserControl1" %>
<asp:Button ID="Button1" runat="server" Text="Edit " OnClientClick="return confirm('Are you certain you want to Navigate?');" Width="341px" onclick="Button1_Click" />

如何從usercontrol分組或激發(文本框值更改)?

從您的用戶控件開始:

<asp:Button ID="Button1" runat="server" Text="Edit " 
    OnClientClick="return confirm('Are you certain you want to Navigate?');" 
    Width="341px" onclick="Button1_Click"/>

在后面的代碼中,使用此代碼創建一個自定義事件,該事件將在button'c click上觸發

using System;
using System.Web.UI;

namespace TestApplication
{
    public partial class Edit : UserControl
    {
        public string DefaultValue { get; set; }
        protected void Page_Load(object sender, EventArgs e)
        {

        }
        private static object EditClickKey = new object();
        public delegate void EditEventHandler(object sender, EditEventArgs e);
        public event EditEventHandler EditClick
        {
            add
            {
                Events.AddHandler(EditClickKey, value);
            }
            remove
            {
                Events.RemoveHandler(EditClickKey, value);
            }
        }
        protected void Button1_Click(object sender, EventArgs e)
        {
            OnEditClick(new EditEventArgs(DefaultValue));
        }
        protected virtual void OnEditClick(EditEventArgs e)
        {
            var handler = (EditEventHandler)Events[EditClickKey];
            if (handler != null)
                handler(this, e);
        }

        public class EditEventArgs : EventArgs
        {
            private string data;
            private EditEventArgs()
            {
            }
            public EditEventArgs(string data)
            {
                this.data = data;
            }
            public string Data
            {
                get 
                {
                    return data;
                }
            }
        }
    }
}

“ Default.aspx”頁面將包含新的自定義事件的事件處理程序。
標記:

<asp:TextBox ID="TextBox1" runat="server" Width="262px"></asp:TextBox>
    <uc1:Edit ID="Edit1" runat="server" OnEditClick="EditClick_OnEditClick" DefaultValue="default" />


代碼背后:

protected void EditClick_OnEditClick(object sender, TestApplication.Edit.EditEventArgs e)
        {
            TextBox1.Text = e.Data;
        }

Button1Button1_Click事件中,您可以使用Page.FindControl()方法獲取對TextBox的引用,如下所示:

protected void Button1_Click(...)
{
     TextBox txtBox = (TextBox)this.Page.FindControl("TextBox1");
     if(txtBox != null)
        txtBox.Text = "Set some text value";
}

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