Question

我想清除所有文本框。将公共职能写成：

public void clean(Control parent)
{
    try
    {
        foreach (Control c in parent.Controls)
        {
            TextBox tb = c as TextBox; //if the control is a textbox
            if (tb != null)//Will be null if c is not a TextBox
            {
                tb.Text = String.Empty;//display nothing
            }
        }
    }
    catch (Exception ex)
    {
        Console.WriteLine("{0} Exception caught.", ex);
    }
}

在页面的类中，我希望它被称为声明：

PublicFunctions pubvar = new PublicFunctions();

我将其称为

pubvar.clean(Page);

但它不起作用......甚至没有抛出错误......我的文本框没有清除......帮助？

Answer 1

您应该使用递归循环来检查所有控件。

试试这段代码

using System;
using System.Collections.Generic;
using System.Web.UI;
using System.Web.UI.WebControls;

public class PublicFunctions 
{
    public void Clean(Control parent)
    {
        var controls = GetAllControls(parent);

        foreach (Control c in controls)
        {
            TextBox tb = c as TextBox;
            if (tb != null)
            {
                tb.Text = String.Empty;
            }
        }
    }

    public IEnumerable<Control> GetAllControls(Control parent)
    {
        foreach (Control control in parent.Controls)
        {
            yield return control;

            foreach (Control innerControl in control.Controls)
            {
                yield return innerControl;
            }
        }
    }
}

无法清除文本框

1 个答案: