如何调用从用户控件aspx页面的方法？ [英] How to call a method from user control to aspx page?

问题描述

我要打电话从用户控件的aspx页面的方法

I want to call a method from user control to aspx page

我想，但我不能够打电话aspx页面的方法

I'm trying but I am not able to call that method in aspx page

code：

AddVisaUserControl.ascx.cs

AddVisaUserControl.ascx.cs

public event EventHandler UserControlButtonClicked;

    public void OnUserControlButtonClick()
    {
        if (UserControlButtonClicked != null)
        {
            UserControlButtonClicked(this,EventArgs.Empty);
        }
    }

protected void btnRemove_Click(object sender, EventArgs e)
    {
        OnUserControlButtonClick();
    }

的.aspx

修改

在低于code当页面加载我得到空引用错误

In the below code when the page load I am getting "null reference error"

AddVisaControl av; 
protected void Page_Load(object sender, EventArgs e)
    {
        av.UserControlButtonClicked  += new
                EventHandler(AddVisaUserControl_UserControlButtonClicked);
    } 

  private void AddVisaControl_UserControlButtonClicked(object sender, EventArgs e)
    {
        var ctrl = (AddVisaControl)LoadControl(@"AddVisaControl.ascx");
        //ctrl.ID = i;
        this.rpt1.Controls.Remove(ctrl);
    }

任何想法？在此先感谢

Any ideas? Thanks in advance

推荐答案

您似乎有未初始化的字段：

You appear to have an uninitialized field:

AddVisaControl av; 

其默认值为空，因此NullReferenceException异常。

whose default value is null, hence the NullReferenceException.

如果您已经添加了用户控件的一个实例到你的ASPX页面，你应该有一个实例，其名称等于用户控件实例的ID：

If you have added an instance of the UserControl to your aspx page, you should have an instance whose name is equal to the ID of the UserControl instance:

===在Page.aspx

=== in Page.aspx

<uc1:AddVisaUserControl ID="MyControl" ... />

===在Page.aspx.cs

=== in Page.aspx.cs

MyControl.UserControlButtonClicked += ...

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