C # Methods for creating controls and getting values in the background

This article describes a way to create a control in the background of C # and get a value. Share to everyone for your reference. The implementation method is as follows:

Front Code:

The code is as follows:

<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 Value" validationgroup= "Showlistcontent"

onclick= "Btnok_click"/>

</div>

<div runat= "Server" id= "Divcontrols" class= "Item" >

</div>

<div runat= "Server" id= "Divmessage" >

</div>

</div>

</form>

Background code:

The code is as follows:

protected void Page_Load (object sender, EventArgs e)

{

if (this. IsPostBack)

{

int txtcount = Int. Parse (Txttextcount.text);

Note: Each time you postback, you need to dynamically create a 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 a TextBox

txt = new TextBox ();

txt.id = "txt" + i.tostring ();

Txt. CssClass = "Input";

Create a format validation control and associate it to 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!";

Adding controls to a 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 the text value in the dynamically created textbox

for (int i = 0; i < Txtcount; i++)

{

Note: The dynamically created TextBox must be obtained through the upper container to get the 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 the text value in the dynamically created textbox

for (int i = 0; i < Txtcount; i++)

{

Note: The dynamically created TextBox must be obtained through the upper container to get the 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 ();

}

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C # Methods for creating controls and getting values in the background

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C # Methods for creating controls and getting values in the background