The method behind C to create the control and get the value
- 2020-12-26 05:51:42
- OfStack
This example shows how C# creates controls behind the scenes and gets values. Share to everybody for everybody reference. Specific implementation methods are as follows:
Foreground code:
<form id="form1" runat="server">
<div>
<div class="item">
Please input a number:
<asp:TextBox runat="server" CssClass="item" ID="txtTextCount"></asp:TextBox>
<asp:Button runat="server" ID="btnCreate" Text="Create TextBox List" ValidationGroup="CreateTextBox"
OnClick="btnCreate_Click" />
<asp:Button runat="server" ID="btnOK" Text=" Get control values " ValidationGroup="ShowListContent"
OnClick="btnOK_Click" />
</div>
<div runat="server" id="divControls" class="item">
</div>
<div runat="server" id="divMessage">
</div>
</div>
</form>
Background code:
protected void Page_Load(object sender, EventArgs e)
{
if (this.IsPostBack)
{
int txtCount = int.Parse(txtTextCount.Text);
// Note: Every time PostBack , both need to be recreated dynamically TextBox
CreateTextBoxList(txtCount);
}
}
///<summary>
/// Create textbox list
///</summary>
///<param name="num">textbox list count</param>
private void CreateTextBoxList(int num)
{
HtmlGenericControl div;
HtmlGenericControl span;
TextBox txt;
//RegularExpressionValidator rev;
for (int i = 0; i < num; i++)
{
// create div
div = new HtmlGenericControl();
div.TagName = "div";
div.ID = "divTextBox" + i.ToString();
div.Attributes["class"] = "item2";
// create span
span = new HtmlGenericControl();
span.ID = "spanTextBox" + i.ToString();
span.InnerHtml = "Url Address" + (i + 1).ToString() + ":";
// create TextBox
txt = new TextBox();
txt.ID = "txt" + i.ToString();
txt.CssClass = "input";
// Create a format validation control and associate it with the corresponding TextBox
//rev = new RegularExpressionValidator();
//rev.ID = "rev" + i.ToString();
//rev.ControlToValidate = txt.ID;
//rev.Display = ValidatorDisplay.Dynamic;
//rev.ValidationGroup = "ShowListContent";
//rev.ValidationExpression = @"(http(s)?://)?([\w-]+\.)+[\w-]+(/[\w- ./?%&=]*)?";
//rev.ErrorMessage = "Invalid url Address!";
// Add controls to the container
div.Controls.Add(span);
div.Controls.Add(txt);
//div.Controls.Add(rev);
divControls.Controls.Add(div);
}
}
protected void btnCreate_Click(object sender, EventArgs e)
{
txtTextCount.Enabled = false;
btnCreate.Enabled = false;
}
protected void btnOK_Click(object sender, EventArgs e)
{
TextBox txt;
HtmlGenericControl span;
StringBuilder sbResult = new StringBuilder();
int txtCount = int.Parse(txtTextCount.Text);
// Traversal gets dynamically created TextBox In the Text value
for (int i = 0; i < txtCount; i++)
{
// Note: You must get the dynamically created ones here through the upper container TextBox , in order to get ViewState content
txt = divControls.FindControl("txt" + i.ToString()) as TextBox;
if (txt != null && txt.Text.Trim().Length > 0)
{
sbResult.AppendFormat("Url Address{0}: {1}.<br />", i + 1, txt.Text.Trim());
}
}
// Traversal gets dynamically created TextBox In the Text value
for (int i = 0; i < txtCount; i++)
{
// Note: You must get the dynamically created ones here through the upper container TextBox , in order to get ViewState content
span = divControls.FindControl("spanTextBox" + i.ToString()) as HtmlGenericControl ;
if (span != null && span.InnerText.Trim().Length > 0)
{
sbResult.AppendFormat("Url Address{0}: {1}.<br />", i + 1, span.InnerText.Trim());
}
}
divMessage.InnerHtml = sbResult.ToString();
}Hopefully this article has helped you with your C# programming.