ASP.NET遍历控件的几种方法

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方法一:javascript法

function btnClear()
{
for(i=0;i<document.forms[0].elements.length;i++)
{
e=document.forms[0].elements[i];
if(e.type=='text'||e.type=='textarea')
{
e.value="";
}
}
return false;
}

在Onclick OnFocus OnLoad等事件中引用就行

方法二:Foreach遍历

foreach(Control ctl in this.Page.Controls[1].Controls)
{

if(ctl.GetType() == typeof(TextBox))
{
TextBox t = (TextBox) ctl;
t.Text = string.Empty;

}

方法三:
#region 清空指定页面上所有的控件内容，public static void ClearAllContent()
/// <summary>
/// 清空指定页面上所有的控件内容，包括TextBox，CheckBox,CheckBoxList,RadioButton,RadioButtonList。但是不清
/// 除如ListBox，DropDownList，因为这样的控件值对当前页面来说还可以用，一般这些控件里都是保存的字典数据。
/// Author：Kevin
/// 日期：2004-12-02
/// </summary>
/// <param name="page"> 指定的页面</param>
public static void ClearAllContent(System.Web.UI.Control page)
{
int nPageControls = page.Controls.Count;
for (int i = 0; i < nPageControls; i++)
{
foreach (System.Web.UI.Control control in page.Controls[i].Controls)
{
if (control.HasControls())
{
ClearAllText(control);
}
else
{
if (control is TextBox)
(control as TextBox).Text = "";

if (control is CheckBox)
(control as CheckBox).Checked = false;

if (control is RadioButtonList)
(control as RadioButtonList).SelectedIndex = -1;

if (control is RadioButton)
(control as RadioButton).Checked = false;

if (control is CheckBoxList)
{
foreach (ListItem item in (control as CheckBoxList).Items)
{
item.Selected = false;
}
}
}//if..else
}//foreach
}//for
}
#endregion

方法四:

建立一个类，用于存放那些TextBox的name和value ，代码如下：
Public Class UtilityObj
Private _name As String
Private _value As String
Public Sub New(ByVal Name As String, ByVal Value As String)
_name = Name
_value = Value
End Sub
Public Property Name() As String
Get
Return _name
End Get
Set(ByVal Value As String)
_name = Name
End Set
End Property
Public Property Value() As String
Get
Return (_value)
End Get
Set(ByVal Value As String)
_value = Value
End Set
End Property
End Class
这个类包含两个属性："name" 和 "value"，再定义一个公有的Arraylist(oArraylist),用于存储数据。如图：

要实现遍历ASP.NET页面所有的控件，我们还需要定义一个主要的方法。这个方法接收一个Control类型的参数，如果这个参数为textbox，则存储它的 name 和 value。
代码如下：
Public Sub LoopingControls(ByVal oControl As Control)
Dim frmCtrl As Control
oArrayList = New ArrayList
For Each frmCtrl In oControl.Controls
If TypeOf frmCtrl Is TextBox Then
oArrayList.Add(New UtilityObj(frmCtrl.ID, DirectCast(frmCtrl, TextBox).Text))
End If
If frmCtrl.HasControls Then
LoopingControls(frmCtrl)
End If
Next
End Sub
使用上面方法来实现遍历页面所有的控件
LoopingControls(Page)
DataGrid1.DataSource = oArrayList
DataGrid1.DataBind()

/// <summary>
/// 遍历页面的label并赋值, /// </summary>
protected void RenameLabel()
{
foreach (Control ctr in this.pnlMaterial.Controls)
{

if (ctr.GetType().ToString() == "System.Web.UI.WebControls.Label")
{
//Response.Write("id:" + ctr.ID+ " text:" + ((Label)ctr).Text + "<br>");

if (ctr.ID.ToString().Length == 6)
{
int LabelId1 = Convert.ToInt32(ctr.ID.Substring(5, 1).ToString().Trim());

((Label)ctr).Text = BLL.EDI.EDIType.GetTypeName(LabelId1);
}

if (ctr.ID.ToString().Length == 7)
{
int LabelId2 = Convert.ToInt32(ctr.ID.Substring(5, 2).ToString().Trim());

((Label)ctr).Text = BLL.EDI.EDIType.GetTypeName(LabelId2);

}

}

}

}

/// <summary>
/// 遍历dropdownlist赋值
/// </summary>
protected void SetDropDownListValue()
{
foreach (Control ctr in this.pnlMaterial.Controls)
{

if (ctr.GetType().ToString() == "System.Web.UI.WebControls.DropDownList")
{
//Response.Write("id:" + ctr.ID + " text:" + ((DropDownList)ctr).DataTextField.ToString() + "<br>");

if (ctr.ID.ToString().Length == 13)
{
int LabelId1 = Convert.ToInt32(ctr.ID.Substring(12, 1).ToString().Trim());

((DropDownList)ctr).DataSource = BLL.EDI.EDIMaterial.List(LabelId1);

((DropDownList)ctr).DataValueField = "mName";

((DropDownList)ctr).DataTextField = "mCode";

((DropDownList)ctr).DataBind();
}

if (ctr.ID.ToString().Length == 14)
{
int LabelId2 = Convert.ToInt32(ctr.ID.Substring(12, 2).ToString().Trim());

((DropDownList)ctr).DataSource = BLL.EDI.EDIMaterial.List(LabelId2);

((DropDownList)ctr).DataValueField = "mName";

((DropDownList)ctr).DataTextField = "mCode";

((DropDownList)ctr).DataBind();
}

}

}

}