[玻璃鱼V]嵌套用户控件间的调用问题

teita731 2009-03-01 07:06:11

页面page_A里使用了用户控件uc_A,用户控件uc_A中嵌套了用户控件uc_B,当触发了用户控件uc_B中的事件后需要调用uc_A中的方法以更新uc_A的内容.

我尝试在uc_B中使用这样的方法来达到目的:

protected void uc_B_Event(param param1)
{
... ...
Page p = this.Parent.Page;
UserControl uc = p.FindControl(uc_A) as UserControl;
Type t = uc.GetType();
MethodInfo mi = t.GetMethod(uc_A_Function);
if (mi != null)
{
mi.Invoke(uc, new object[] {});
}
}

错误提示:"System.NullReferenceException: 未将对象引用设置到对象的实例"
错误提示行:Type t = uc.GetType();

如何在嵌套用户控件中互相调用其方法呢?

...全文

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teita731 2009-03-01

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的确,1楼的代码通过检测.

谢谢了~

teita731 2009-03-01

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但是我在uc_B中查看过this.Parent的值,是调用uc_A的页面page_A阿,并不是uc_A.

我姓区不姓区 2009-03-01

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以上写法是针对Web Site项目，如果你的项目是WebApplication,那就更简单了:



        protected void Button1_Click(object sender, EventArgs e)

        {

            if (this.Parent is WebUserControl1)

            {

                WebUserControl1 wuc = this.Parent as WebUserControl1;

                wuc.SetText("Hello");

            }

        }

我姓区不姓区 2009-03-01

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给你写个例子:
UserControl1:



<%@ Control Language="C#" AutoEventWireup="true" CodeBehind="WebUserControl1.ascx.cs" Inherits="WebApplication1.WebUserControl1" %>

<%@ Register Src="~/WebUserControl2.ascx" TagPrefix="my" TagName="uc2" %>



<my:uc2 runat="server" ID="UC2" />

<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>



    public partial class WebUserControl1 : System.Web.UI.UserControl

    {

        protected void Page_Load(object sender, EventArgs e)

        {



        }



        public void SetText(string str)

        {

            this.TextBox1.Text = str;

        }

    }

UserControl2:



<%@ Control Language="C#" AutoEventWireup="true" CodeBehind="WebUserControl2.ascx.cs" Inherits="WebApplication1.WebUserControl2" %>

<asp:Button ID="Button1" runat="server" Text="Button" OnClick="Button1_Click" />



    public partial class WebUserControl2 : System.Web.UI.UserControl

    {

        protected void Page_Load(object sender, EventArgs e)

        {



        }



        protected void Button1_Click(object sender, EventArgs e)

        {

            if (this.Parent is UserControl)

            {

                System.Reflection.MethodInfo mi = this.Parent.GetType().GetMethod("SetText", System.Reflection.BindingFlags.Instance | System.Reflection.BindingFlags.Public);

                if (mi != null)

                {

                    mi.Invoke(this.Parent, new object[] { "Hello" });

                }

            }

        }

    }

调用页:



<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="flash.aspx.cs" Inherits="WebApplication1.flash" %>

<%@ Register Src="~/WebUserControl1.ascx" TagPrefix="my" TagName="uc1" %>

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

<html xmlns="http://www.w3.org/1999/xhtml">

<head runat="server">

    <title></title>

</head>

<body>

    <form id="form1" runat="server">

    <div>

        <my:uc1 ID="UC1" runat="server"></my:uc1>

    </div>

    </form>

</body>

</html>