自定义 Web 控制和回发

发布于 2024-10-19 16:11:06 字数 1046 浏览 4 评论 0原文

我正在尝试创建一些包装一些现有控件的自定义 Web 控件。例如，其中之一是文本框的包装（因为我需要其他行为，例如相应的验证器）。问题是，我不确定如何获取要在回发中发送的该控件的数据。

一个非常简单的示例：

public class MyTestBox: WebControl
{
protected TB { get; set; }
public Text
{
    get { return TB.Text; }
    set { TB.Text = value; }
}
protected override void CreateChildControls()
{
TB= new TextBox()
Controls.Add(TB);
}
}

但是，如果我现在使用以下控件测试 Web 表单：

<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
<bleh:MyTextBox ID="MyTextBox1" runat="server" />
<asp:Button ID="Button1" runat="server" Text="Submit" />

然后在文本框中输入文本并提交后，TextBox1 中的文本在 Page_Load 中可用，而 MyTextBox1.Text 为空。我应该更改什么才能在发送回发时使其内容可用？

编辑：

我现在想到的是在初始化控件时简单地检查请求表单：

protected override void OnInit(EventArgs e)
{
    TB.ID = this.ID + "_TextBox1";
    Controls.Add(TB);
    if (Page.Request.Form[TB.UniqueID] != null)
    {
         Text = Page.Request.Form[TB.UniqueID];
    }
}

它似乎有效，但感觉有点hacky。这看起来是一个合理的方式吗？

原文

I'm trying to create a few custom web controls wrapping some existing controls. One of them, for instance, is a wrap for a textbox (because I need additional behaviors such as corresponding validators). The problem is, I'm not sure how to get the data of that control to be sent in the postback.

A very simplified example:

public class MyTestBox: WebControl
{
protected TB { get; set; }
public Text
{
    get { return TB.Text; }
    set { TB.Text = value; }
}
protected override void CreateChildControls()
{
TB= new TextBox()
Controls.Add(TB);
}
}

But if I now test a webform with the control:

<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
<bleh:MyTextBox ID="MyTextBox1" runat="server" />
<asp:Button ID="Button1" runat="server" Text="Submit" />

Then after entering text into the textboxes and submitting, the text in TextBox1 is available in Page_Load, while MyTextBox1.Text is empty. What should I change to have its content available when sending a postback?

Edit:

Something I thought of now is to simply check the request form when initializing the control:

protected override void OnInit(EventArgs e)
{
    TB.ID = this.ID + "_TextBox1";
    Controls.Add(TB);
    if (Page.Request.Form[TB.UniqueID] != null)
    {
         Text = Page.Request.Form[TB.UniqueID];
    }
}

It seems to be working, but feels sort of hacky. Does this seem like a reasonable way?

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长伴 2024-10-26 16:11:06

您应该为动态生成的 TextBox 提供一个 ID，然后在控件的 Text 属性上，您应该找到该 TextBox 并返回其 Text。

public class BksTextBox: WebControl
{
protected TB { get; set; }
public Text
{
    get 
    { 
       return ((TextBox)this.FindControl("txt")).Text;
    }
}
protected override void CreateChildControls()
{
TB= new TextBox()
TB.ID = "txt";
Controls.Add(TB);
}
}

You should give the dynamically generated TextBox an ID, then on the Text property of your control, you should find the TextBox and return its Text.

public class BksTextBox: WebControl
{
protected TB { get; set; }
public Text
{
    get 
    { 
       return ((TextBox)this.FindControl("txt")).Text;
    }
}
protected override void CreateChildControls()
{
TB= new TextBox()
TB.ID = "txt";
Controls.Add(TB);
}
}

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眼藏柔 2024-10-26 16:11:06

我没听清你的问题。
如果您需要向 Web 控件添加一些额外的行为，您应该执行与您想要扩展继承的类行为时相同的操作。
您可以直接继承 TextBox 类并添加您需要的所有额外行为

 public class BksTextBox: TextBox
  {
    //it is just as example
    public string TextToUpperCase
    {
    get
      {
       return Text.ToUpperCase();
       }
     }

}

I was not getting your question.
If you need to add some extra behaviour to a web control you should do the same thing you would do in the case you want extend a class behaviour that is inheritance.
you can Inherits straigh form the TextBox class and add all the extra behaviour you need

 public class BksTextBox: TextBox
  {
    //it is just as example
    public string TextToUpperCase
    {
    get
      {
       return Text.ToUpperCase();
       }
     }

}

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