如何清除code-后面的所有表单字段？ [英] How to clear all form fields from code-behind?

问题描述

HTML有一个输入按钮类型，以表单中的所有字段重置为初始状态在一步：＆LT;输入类型=复位... /＆GT; 。

HTML has an input button type to reset all fields in a form to their initial state in one step: <input type="reset" ... />.

有没有类似简单的方法来从code-背后重置aspx页面的所有表单域？或者是否有必要用 TextBox1.Text =的String.Empty ， TextBox2.Text =的String.Empty 等？

Is there a similar simple way to reset all form fields of an aspx page from code-behind? Or is it necessary to reset all controls one by one with TextBox1.Text=string.Empty, TextBox2.Text=string.Empty, etc. ?

在此先感谢！

更新：

上下文是一个简单的联系人/给我们留言页面8 ASP：文本框的页面（即用户输入的姓名，地址，电话，电子邮件，短信等）上。然后，他点击提交的onclick消息处理程序在code-后面将电子邮件发送到某些管理员，和所有的表单字段填写用户应该被清空，他得到一个通知，一个标签（消息发送布拉布拉。 ..）。我想有清除，以避免用户点击再次提交和相同的邮件发送第二次的表单字段。

Context is a simple Contact/"Send us a message" page with 8 asp:TextBoxes on the page (where the user enters the name, address, phone, email, message, etc.). Then he clicks on submit, the Onclick message handler in code-behind sends an email to some administrator, and all the form fields the user filled in should be emptied and he gets a notification in a label ("Message sent blabla..."). I want to have the form fields cleared to avoid that the user clicks again on submit and the same message is sent a second time.

推荐答案

您只需要编写每种类型的控制的一个分支，除非控制人有一些特别的东西，需要做重新设置。

You need only write a fork for each type of control unless one of the control has something special that needs to be done to reset it.

foreach( var control in this.Controls )
{
    var textbox = control as TextBox;
    if (textbox != null)
        textbox.Text = string.Empty;

    var dropDownList = control as DropDownList;
    if (dropDownList != null)
        dropDownList.SelectedIndex = 0;
    ...
}

加成您问到如何清除控制甚至被埋没的。为了做到这一点，你应该创建一个递归过程，像这样：

ADDITION You asked how to clear controls even ones that are buried. To do that, you should create a recursive routine like so:

private void ClearControl( Control control )
{
    var textbox = control as TextBox;
    if (textbox != null)
        textbox.Text = string.Empty;

    var dropDownList = control as DropDownList;
    if (dropDownList != null)
        dropDownList.SelectedIndex = 0;
    ...

    foreach( Control childControl in control.Controls )
    {
        ClearControl( childControl );
    }
}

所以，你会传递的页面调用这个：

So, you would call this by passing the page:

ClearControls( this );

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