ASP.NET-动态创建控件 [英] ASP.NET - Creating controls dynamically

问题描述

朋友，

当我单击链接按钮时，我想在一个占位符内生成一个动态控件(3个文本框和2个下拉列表).我实现了它，但是我特别想要的是，当我单击链接按钮时，它应该连续创建那些控件.我的代码只生成了一次.

我在下面粘贴了我的代码.

Hi Friends,

I want to generate a dynamic controls(3 textboxes and 2 dropdownlist) inside a place holder when i click a link button. I acheived it but what I specifically wanted is when ever I click a link button it should created those controls in a row. My code generated only one time.

I have pasted my code below.

protected void AddSkills_Click(object sender, EventArgs e)
   {

           TextBox txtSkill = new TextBox();
           TextBox txtVersion = new TextBox();
           TextBox txtLastUsed = new TextBox();
           DropDownList ddlExpYears = new DropDownList();
           DropDownList ddlExpMonths = new DropDownList();




           SkillPlaceHolder.Controls.Add(txtSkill);

           SkillPlaceHolder.Controls.Add(txtVersion);

           SkillPlaceHolder.Controls.Add(txtLastUsed);

           SkillPlaceHolder.Controls.Add(ddlExpYears);

           SkillPlaceHolder.Controls.Add(ddlExpMonths);

       }

请告诉我每次单击链接时如何更改此代码并连续生成那些控件.希望你理解我的问题.

亲切的问候
Azeem

Kindly tell me how can i change this code and generate those controls in a row each time I click on a link. Hope you understand my question.

Kind regards
Azeem

推荐答案

选中此选项，对我来说效果很好

check this one , it work fine with me

int countTimes = 0;
    protected void LinkButton1_Click(object sender, EventArgs e)
    {
        if (ViewState["countTimes"] == null)
        {
            countTimes = 1;
        }
        else
        {
            countTimes = Convert.ToInt32(ViewState["countTimes"]);
        }


        for (int i = 0; i < countTimes; i++)
        {
            TextBox txtSkill = new TextBox();
            txtSkill.ID = "txtSkill"+i;
            TextBox txtVersion = new TextBox();
            txtVersion.ID = "txtVersion" + i;
            TextBox txtLastUsed = new TextBox();
            txtLastUsed.ID = "txtLastUsed"+i;
            DropDownList ddlExpYears = new DropDownList();
            ddlExpYears.ID = "ddlExpYears" + i;

            DropDownList ddlExpMonths = new DropDownList();
            ddlExpMonths.ID = "ddlExpMonths"+i;

            Form.Controls.Add(txtSkill);
            Form.Controls.Add(txtVersion);
            Form.Controls.Add(txtLastUsed);
            Form.Controls.Add(ddlExpYears);
            Form.Controls.Add(ddlExpMonths);
            Form.Controls.Add(txtSkill);
            
        }
        countTimes = countTimes + 1;
        ViewState.Add("countTimes", countTimes);
    }

Hello Mohamed，

我想您不明白我的问题，在表单加载后单击链接按钮时，我上面发布的代码仅一次添加了控件，但是我希望每次单击链接按钮时都创建一个控件一次.您的代码无法解决我的问题.

亲切的问候
Azeem

Hello Mohamed,

I think you didn''t understand my question, the code I posted above adding the controls only one time when we click on a link button after form load, but I want this to be created each time I click on a link button not only once. Your code doesn''t solve my issue.

Kind regards
Azeem

您错过了一些有用的细节.当您说连续"时，是指GridView行或HTML表格行，还是其他.

对于GridView，您可以将一个项目添加到它绑定到的数据源并重新绑定它，这将自动创建控件.与Repeater或DataList相同的原因.
使用中继器，您可以向页脚添加一组控件，然后在必要时使用JavaScript克隆它们.

You have missed some useful details. When you say "in a row" do you mean in a GridView row or HTML table row, or something else.

In the case of a GridView you could just add an item to the datasource it is bound to and rebind it, this will automatically create the controls. Same why with a Repeater or DataList.

Using a Repeater you could add a set of controls to the footer then clone them using JavaScript when necessary.

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