关于asp.net:Array of textbox并标记如何在c＃中的submit方法中获取值

Array of textbox and labels how to get value in submit method in c#

我曾经在下拉列表中动态创建标签和文本框，选择索引更改方法，以及如何在提交方法中获取这些文本框值…

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public partial class StudentMarklistEntry : System.Web.UI.Page
{
private Label[] sublabels = new Label[7];
private TextBox[] subtextbox = new TextBox[7];

protected void semDropDownList_SelectedIndexChanged(object sender, EventArgs e)
{
int sem = int.Parse(semDropDownList.SelectedItem.Text);
string dept = DeptDropDownList.SelectedItem.Text;
if (sem != null)
{
SqlDataReader subject = Mlist.GetSubjects(d_id,sem);
int i = 0;
while (subject.Read())
{
sublabels[i] = new Label();
subtextbox[i] = new TextBox();
sublabels[i].Text = sub;
sublabels[i].ID = (subject["SUB_ID"]).ToString();
markz[i] = Convert.ToString(subject["SUB_ID"]);
subtextbox[i].ID ="subtextbox"+i.ToString();
labelPlaceHolder.Controls.Add(sublabels[i]);
labelPlaceHolder.Controls.Add(new LiteralControl(""));
Textboxholder.Controls.Add(subtextbox[i]);
Textboxholder.Controls.Add(new LiteralControl(""));
i++;

}

subject.Close();
}

protected void SaveButton_Click(object sender, EventArgs e)
{

}

}

相关讨论

可以通过两种方式访问控制值

循环通过占位符控件

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IList<string> selectedValues= new List<string>();
foreach (Control control in placeHolderText.Controls)
{
if (control is TextBox)
{
var textBox = control as TextBox;
selectedValues.Add(textBox.Text);
}
}

使用request.form

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var keys = Request.Form.AllKeys.Where(formKey => formKey.Contains("subtextbox"));
foreach (var formKey in keys)
{
selectedValues.Add(Request.Form[formKey]);
}

更新

关于控件的"提交时可见性"按钮单击的问题，这是一个问题，因为您正在DropDownList SelectedIndexChanged事件中创建文本框。在按钮单击事件中，占位符将为空，因为根本没有创建控件。作为解决方法，您可以尝试以下方法。

创建如下函数

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private void CreateDynamicControls()
{
int sem = int.Parse(semDropDownList.SelectedItem.Text);
string dept = DeptDropDownList.SelectedItem.Text;
if (sem != null)
{
SqlDataReader subject = Mlist.GetSubjects(d_id, sem);
int i = 0;
while (subject.Read())
{
sublabels[i] = new Label();
subtextbox[i] = new TextBox();
sublabels[i].Text = sub;
sublabels[i].ID = (subject["SUB_ID"]).ToString();
markz[i] = Convert.ToString(subject["SUB_ID"]);
subtextbox[i].ID ="subtextbox" + i.ToString();
labelPlaceHolder.Controls.Add(sublabels[i]);
labelPlaceHolder.Controls.Add(new LiteralControl(""));
Textboxholder.Controls.Add(subtextbox[i]);
Textboxholder.Controls.Add(new LiteralControl(""));
i++;

}

subject.Close();

}
}

调用pageload中的两个函数(out side the！isPostback块)和semDropDownList_SelectedIndexChanged事件。