如何查询页面上所有textbox，并赋值。

Question

我的代码如下（asp.net2005）
For Each c As Control In Page.Controls
            If TypeOf c Is TextBox Then
                Select Case c.ClientID
                    Case "TextBox1"
                        DirectCast(c, TextBox).Text = "a1"
                    Case "TextBox2"
                        DirectCast(c, TextBox).Text = "a2"
                    Case "TextBox3"
                        DirectCast(c, TextBox).Text = "a3"
                End Select
            End If
        Next不知道哪里出错，就是不能赋值。请各路高手指点

Answer 1

For Each c As Control In Page.Controls 
=====
For Each c As Control In Page.Form.Controls 

Answer 2

foreach (Control cc in Page.Form.Controls)
            {
                if (cc.GetType() ==typeof(TextBox))
                {
                    ((TextBox)cc).Text = "aa";
                }
            }

Answer 3

For Each c As Control In Me.Controls 
            If c Is TextBox Then 
                Select Case c.ClientID 
                    Case "TextBox1" 
                        DirectCast(c, TextBox).Text = "a1" 
                    Case "TextBox2" 
                        DirectCast(c, TextBox).Text = "a2" 
                    Case "TextBox3" 
                        DirectCast(c, TextBox).Text = "a3" 
                End Select 
            End If 
        Next 

Answer 4

string id = string.Empty;
            string controlID = string.Empty;
            for (int i = 0; i < this.Controls.Count; i++)
            {
                foreach (System.Web.UI.Control control in this.Controls[i].Controls)
                {
                    if (control is TextBox)
                    {
                        controlID = (control as TextBox).ID;
                        string[] textBoxHeads = textBoxHead.Split(',');
                        for (int j = 0; j < textBoxHeads.Length; j++)
                        {
                            if (controlID.IndexOf(textBoxHeads[j]) == 0)
                            {
                                id = controlID.Substring(textBoxHeads[j].Length);
                                if (dt.ContainCol(id))
                                {
                                    //try
                                    //{
                                    (control as TextBox).Text = dt.GetValue(id).Trim();
                                    //}
                                    //catch
                                    //{
                                    //}
                                }
                            }
                        }                    }
                    else if (control is HtmlInputHidden)
                    {
                        controlID = (control as HtmlInputHidden).ID;
                        string[] valueListHeads = hiValueHead.Split(',');
                        for (int j = 0; j < valueListHeads.Length; j++)
                        {
                            if (controlID.IndexOf(valueListHeads[j]) == 0)
                            {
                                id = controlID.Substring(valueListHeads[j].Length);
                                if (dt.ContainCol(id))
                                {
                                    (control as HtmlInputHidden).Value = dt.GetValue(id).Trim();
                                }
                            }
                        }
                    }
                    else if (control is HtmlInputText)
                    {
                        controlID = (control as HtmlInputText).ID;
                        string[] valueListHeads = hiValueHead.Split(',');
                        for (int j = 0; j < valueListHeads.Length; j++)
                        {
                            if (controlID.IndexOf(valueListHeads[j]) == 0)
                            {
                                id = controlID.Substring(valueListHeads[j].Length);
                                if (dt.ContainCol(id))
                                {
                                    (control as HtmlInputText).Value = dt.GetValue(id).Trim();
                                }
                            }
                        }
                    }
                    else if (control is DropDownList)
                    {
                        controlID = (control as DropDownList).ID;
                        string[] dropDownListHeads = dropDownListHead.Split(',');
                        for (int j = 0; j < dropDownListHeads.Length; j++)
                        {
                            if (controlID.IndexOf(dropDownListHeads[j]) == 0)
                            {
                                id = controlID.Substring(dropDownListHeads[j].Length);
                                if (dt.ContainCol(id))
                                {
                                    (control as DropDownList).SelectedValue = dt.GetValue(id).Trim();
                                }
                            }
                        }
                    }
                    //(control as TextBox).Text = "";
                }
            }