[英]How can I get the CheckBoxList selected values, what I have doesn't seem to work C#.NET/VisualWebPart
我在類文件中創建一個CheckBoxList,並使用HTMLTextWriter來呈現控件。
我正在使用以下代碼將所選值存儲在字符串中:
string YrStr = "";
for (int i = 0; i < YrChkBox.Items.Count; i++)
{
if (YrChkBox.Items[i].Selected)
{
YrStr += YrChkBox.Items[i].Value + ";";
}
}
我逐步完成了代碼,它似乎沒有觸及if語句的內部,並且每次選中的value屬性都是false ...任何人都知道如何解決這個問題?
我使用以下內容填充它:
YrChkBox.Items.Add(new ListItem("Item 1", "Item1"));
在你的ASPX頁面中你有這樣的列表:
<asp:CheckBoxList ID="YrChkBox" runat="server"
onselectedindexchanged="YrChkBox_SelectedIndexChanged"></asp:CheckBoxList>
<asp:Button ID="button" runat="server" Text="Submit" />
在aspx.cs頁面后面的代碼中,你有:
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
// Populate the CheckBoxList items only when it's not a postback.
YrChkBox.Items.Add(new ListItem("Item 1", "Item1"));
YrChkBox.Items.Add(new ListItem("Item 2", "Item2"));
}
}
protected void YrChkBox_SelectedIndexChanged(object sender, EventArgs e)
{
// Create the list to store.
List<String> YrStrList = new List<string>();
// Loop through each item.
foreach (ListItem item in YrChkBox.Items)
{
if (item.Selected)
{
// If the item is selected, add the value to the list.
YrStrList.Add(item.Value);
}
else
{
// Item is not selected, do something else.
}
}
// Join the string together using the ; delimiter.
String YrStr = String.Join(";", YrStrList.ToArray());
// Write to the page the value.
Response.Write(String.Concat("Selected Items: ", YrStr));
}
確保使用if (!IsPostBack) { }
條件,因為如果在每次頁面刷新時加載它,它實際上會破壞數據。
嘗試這樣的事情:
foreach (ListItem listItem in YrChkBox.Items)
{
if (listItem.Selected)
{
//do some work
}
else
{
//do something else
}
}
string items = string.Empty;
foreach (ListItem i in CheckBoxList1.Items)
{
if (i.Selected == true)
{
items += i.Text + ",";
}
}
Response.Write("selected items"+ items);
實現這一點的一種優雅方式是創建一個擴展方法,如下所示:
public static class Extensions
{
public static List<string> GetSelectedItems(this CheckBoxList cbl)
{
var result = new List<string>();
foreach (ListItem item in cbl.Items)
if (item.Selected)
result.Add(item.Value);
return result;
}
}
然后我可以使用這樣的東西來組成一個字符串,將所有值分隔為';':
string.Join(";", cbl.GetSelectedItems());
// Page.aspx //
// To count checklist item
int a = ChkMonth.Items.Count;
int count = 0;
for (var i = 0; i < a; i++)
{
if (ChkMonth.Items[i].Selected == true)
{
count++;
}
}
// Page.aspx.cs //
// To access checkbox list item's value //
string YrStrList = "";
foreach (ListItem listItem in ChkMonth.Items)
{
if (listItem.Selected)
{
YrStrList = YrStrList + "'" + listItem.Value + "'" + ",";
}
}
sMonthStr = YrStrList.ToString();
// aspx.cs
//將CheckBoxList選中的項加載到ListBox中
int status = 1;
foreach (ListItem s in chklstStates.Items )
{
if (s.Selected == true)
{
if (ListBox1.Items.Count == 0)
{
ListBox1.Items.Add(s.Text);
}
else
{
foreach (ListItem list in ListBox1.Items)
{
if (list.Text == s.Text)
{
status = status * 0;
}
else
{
status = status * 1;
}
}
if (status == 0)
{ }
else
{
ListBox1.Items.Add(s.Text);
}
status = 1;
}
}
}
}
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