使用参数动态加载用户控件

Load user control dynamically with parameters(使用参数动态加载用户控件)

问题描述

我已经创建了一个用户控件.

I've created a user control.

public partial class Controls_pageGeneral : System.Web.UI.UserControl
{

    private int pageId;
    private int itemIndex;

    public int PageId
    {
        get { return pageId; }
        set { pageId = value; }
    }

    public int ItemIndex
    {
        get { return itemIndex; }
        set { itemIndex = value; }
    }

    protected void Page_Load(object sender, EventArgs e)
    {
        // something very cool happens here, according to the values of pageId and itemIndex
    }

}

现在我想动态地创建这个控件并传递参数.我试过使用 LoadControl 函数，但它只有两个构造函数:一个带有字符串(路径)，另一个带有类型 t 和参数数组.

Now I want to dynamically create this control and pass it parameters. I've tried using the LoadControl function but it only has two constructor: one with string (path), and another with Type t and array of parameters.

第一种方法可行，但由于我的参数，必须使用 LoadControl 更复杂的方法，但我不知道如何使用它.如何将我的 Control 的路径字符串设置为那个奇怪的对象 Type t?

The first method works, but because of my parameters and have to use the more complicated method of LoadControl, but I don't get how to use it. How can I case my path string of my Control to that weird object Type t?

推荐答案

在您的情况下，它不相关，因为第二种方法接受传递给适当构造函数的参数，但您根本没有构造函数来控制.

In your case it's not relevant, as the second method accepts parameters passed to proper constructor, but you don't have constructor at all to your control.

只需使用 .ascx 文件的路径加载控件，转换为正确的类型并一一设置属性:

Just load the control using the path of the .ascx file, cast to proper type and set the properties one by one:

Controls_pageGeneral myControl = (Controls_pageGeneral)Page.LoadControl("path here");
myControl.PageId = 1;
myControl.ItemIndex = 2;

如果你坚持使用构造函数，先添加这样的:

If you insist on using constructor, first add such:

public Controls_pageGeneral(int pageId, int itemIndex)
{
    //code here..
}

然后:

Page.LoadControl(typeof(Controls_pageGeneral), new object[] {1, 2});

将执行与上述相同的操作，因为运行时代码将寻找接受两个整数的构造函数并使用它.

Will do the same as the above as the runtime code will look for constructor accepting two integers and use it.

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