二个自己定义控件之间的传值 _c#怎么在ascx取uc传的值-优快云博客

本文链接：https://blog.youkuaiyun.com/cxzhq2002/article/details/2103580

本文介绍如何在两个自定义ASP.NET控件之间传递文本框的值到标签控件，通过事件和委托机制实现控件间的通信。

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使用事件

=========================
目的：
实现 Index.aspx 页面中自己定义控件 UC1.ascx 中的 TextBox1 的值传给自己定义控件 UC2.ascx 的 Label

具体实现如下：

UC1.ascx

<%@ Control Language="C#" ClassName="UC1" %>

    public class Button1EventArgs : EventArgs
    {
        public readonly string text;
        public Button1EventArgs(string inpuText)
        {
            this.text = inpuText;
        }
    }
    public delegate void Button1ClickEventHandler(object sender, Button1EventArgs e);

    public event Button1ClickEventHandler Button1Click;

    protected void Button1_Click(object sender, EventArgs e)
    {
        Button1EventArgs button1EventArgs = new Button1EventArgs(this.TextBox1.Text);
        Button1Click(sender, button1EventArgs);
    }

protected void Page_Load(object sender, EventArgs e)
{

}
</script>

自己定义控件一：<br />
<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox><br />
<asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="Button1"

UC2.ascx

<%@ Control Language="C#" ClassName="UC2" %>

protected void Page_Load(object sender, EventArgs e)
{

}
</script>

自己定义控件二：<br />
<br />
<asp:Label ID="Label1" runat="server" Text="Label"></asp:Label>

index.apx

<%@ Page Language="C#" %>

<%@ Register Src="UC1.ascx" TagName="UC1" TagPrefix="uc1" %>
<%@ Register Src="UC2.ascx" TagName="UC2" TagPrefix="uc2" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

    protected void SetUC2Lable(object sender, UC1.Button1EventArgs e)
    {
        ((Label)this.UC2_1.FindControl("Label1")).Text = e.text;
        Response.Write(e.text);
    }

protected void Page_Load(object sender, EventArgs e)
{

}
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
    <title>二个自己定义控件之间的传值</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <uc1:UC1 id="UC1_1" runat="server" OnButton1Click=SetUC2Lable></uc1:UC1><br />
        将自定义控件一中TextBox1的值传到自定义控件二的Lable1
        <br />
        <br />
        <uc2:UC2 ID="UC2_1" runat="server" />
          </div>
    </form>
</body>
</html>
==============================

使用委托

index.aspx

<%@ Page Language="C#" %>

<%@ Register Src="UC1.ascx" TagName="UC1" TagPrefix="uc1" %>
<%@ Register Src="UC2.ascx" TagName="UC2" TagPrefix="uc2" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

    protected void SetUC2Lable(string text)
    {
        ((Label)this.UC2_1.FindControl("Label1")).Text = text;
    }
    protected void Page_Load(object sender, EventArgs e)
    {
        this.UC1_1.Button1Click = new UC1.Button1ClickEventHandler(SetUC2Lable);
    }
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
    <title>二个自己定义控件之间的传值</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <uc1:UC1 id="UC1_1" runat="server"></uc1:UC1><br />
        将自定义控件一中TextBox1的值传到自定义控件二的Lable1
        <br />
        <br />
        <uc2:UC2 ID="UC2_1" runat="server" />
          </div>
    </form>
</body>
</html>

uc1.ascx

<%@ Control Language="C#" ClassName="UC1" %>

public delegate void Button1ClickEventHandler(string text);
public Button1ClickEventHandler Button1Click;

    protected void Button1_Click(object sender, EventArgs e)
    {
        if(Button1Click!=null)
        Button1Click(this.TextBox1.Text);

    }

protected void Page_Load(object sender, EventArgs e)
{

}
</script>

自己定义控件一：<br />
<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox><br />
<asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="Button1" />

使用控件树

uc1.ascx

   protected void Button1_Click(object sender, EventArgs e)
    {
        UserControl UC2_1 = (UserControl)this.Parent.FindControl("UC2_1");
        Label Label1 = (Label)UC2_1.FindControl("Label1");
        Label1.Text = this.TextBox1.Text;
    }

=====================

委托一般用于回调，一般参数为空，返回为void,(调用自，或其它对象)，如线程，

事件，一般交互方式，1,调用其它对象的方法，2将自已对象中的封装数据传递给其它对象，

即其它对象可以访问主对象的数据，主对象也可以通过调用其它对象的方法。

总体而言，两者本质一样