覆盖Text属性设置为自动微调文本框的值 [英] Override Text Property to auto trim Textbox value

问题描述

我要重写文本的文本框将其值设置为自动修剪的属性。对于这一点，我不得不定义以下类：

I want to override the Text property of a textbox to set its value as auto trimmed. For that, I had to define the following class:

public class TextBox : System.Web.UI.WebControls.TextBox
{
    public override string Text
    {
        get { return base.Text.Trim(); }

        //Automatically trim the Text property as it gets assigned
        set { base.Text = value.Trim(); }
    }
}

但问题是，它不工作在设计页面（的.aspx）定义的文本框，它仅适用于动态创建的文本框。

But the issue is that it's not working for TextBoxes defined in a design page (.aspx) and it only works for dynamically created Textboxes.

我需要这样code返回无论是动态或静态地增加了对所有文本框一个修整值。

I need such code that returns a trimmed value for all TextBoxes whether it is added dynamically or statically.

我该如何解决这个问题？

How can I fix this?

推荐答案

您应该创建一个自定义的控制，并给它一个不同的名称。

You should create a custom control and give it a different name.

[DefaultProperty("Text")]
[ToolboxData("<{0}:TrimmedTextBox runat=server></{0}:TrimmedTextBox>")]
public class TrimmedTextBox : TextBox
{
    [Category("Appearance")]
    public override string Text
    {
            get { return base.Text.Trim(); }
            //Automatically trim the Text property as it gets assigned
            set { base.Text = value.Trim(); }
    }
}

在此之后，打开你的AssemblyInfo.cs，并在底部添加以下行：

After this, open your AssemblyInfo.cs and add the following line at the bottom:

 //[assembly: TagPrefix("yournamespace", "aspCustom")]
 [assembly: TagPrefix("WebformsSandbox", "aspCustom")]
 //change "aspCustom" to the prefix of your choice!

在这你的工具应该可以在设计时：

After this your tool should be available at design-time:

要拨打标记code您的自定义的元素，无论是从工具箱中绘制到code或写：

To call your Custom element in markup code, either draw it from the toolbox into the code or write:

<aspCustom:TrimmedTextBox ID="TrimmedTextBox1" runat="server"></aspCustom:TrimmedTextBox>

//修改
我已经 p.campbell 发现了另一个可行的解决方案在这里：的查找一个页面所有文本框控件

//EDIT I have found another working solution here by p.campbell: Find all textbox control in a page

这避免了在所有创建自定义元素。你要做的就是在您的扩展类中定义helpermethod：

This avoids creating a custom element at all. What you do is define a helpermethod in your Extensions class:

public static IEnumerable<Control> FindAll(this ControlCollection collection)
{
    foreach (Control item in collection)
    {
        yield return item;

        if (item.HasControls())
        {
            foreach (var subItem in item.Controls.FindAll())
            {
                yield return subItem;
            }
        }
    }
}

您已经这样做了之后，你可以在你的所有TextBox控件的页面上迭代，并修剪文本：

After you have done this, you can iterate over all your Textbox controls on your page and trim the text:

foreach (var t in this.Controls.FindAll().OfType<TextBox>())
{ 
    t.Text = t.Text.Trim();
}

您应该能够过滤此更通过其中（T =方式＆gt; t.Id.Contains（someValue中）或任何你喜欢

You should be able to filter this even more by using Where(t => t.Id.Contains("someValue") or whatever you like.

您认为更好的是什么给你。

What you deem better is up to you.

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