Asp.net 如何将arraylist传递给switch语句
我想传递arraylist to switch语句,下面是代码:Asp.net 如何将arraylist传递给switch语句,asp.net,viewstate,switch-statement,Asp.net,Viewstate,Switch Statement,我想传递arraylist to switch语句,下面是代码: protected void CheckBoxList1_SelectedIndexChanged(object sender, EventArgs e) { ArrayList myList = new ArrayList(); foreach (ListItem listitem in CheckBoxList1.Items) { if (listitem.Selected)
protected void CheckBoxList1_SelectedIndexChanged(object sender, EventArgs e)
{
ArrayList myList = new ArrayList();
foreach (ListItem listitem in CheckBoxList1.Items)
{
if (listitem.Selected)
myList.Add(listitem.Value);
}
ViewState["myList"] = myList;
CurrentPage = 0;
BindGrid();
}
private void BindGrid()
{
DataTable dt = null;
switch (ViewState["myList"]) //gives an error
{ case myList[1]: dt = caravans.GetSelectedFilter(myList); break;
default: dt = caravans.GetAllCaravans(); break;
pds.DataSource = dt.DefaultView;
pds.AllowPaging = true;
pds.PageSize = 12;//add the page index when item exceeds 12 //Convert.ToInt16(ddlPageSize.SelectedValue);
pds.CurrentPageIndex = CurrentPage;
DataList1.RepeatColumns = 4; // 4 items per line
DataList1.RepeatDirection = RepeatDirection.Horizontal;
DataList1.DataSource = pds;
DataList1.DataBind();
// lnkbtnNext.Enabled = !pds.IsLastPage;
ImageButton2.Enabled = !pds.IsLastPage;
// lnkbtnPrevious.Enabled = !pds.IsFirstPage;
doPaging();
}
从MSDN:
switch语句的控制类型由switch表达式建立。如果switch表达式的类型是sbyte、byte、short、ushort、int、uint、long、ulong、char、string或枚举类型,则这是switch语句的控制类型。否则,必须存在一个用户定义的隐式转换(第6.4节),从开关表达式的类型转换为以下可能的控制类型之一:sbyte、byte、short、ushort、int、uint、long、ulong、char、string如果不存在此类隐式转换,或者存在多个此类隐式转换,则会发生编译时错误。
是否有其他方法可以实现此目的尝试使用if,else if语句我可以通过ViewState传递arraylist吗是的,您可以使用Add方法在ViewState中保存arraylist:ViewState.Add(“arraylist Key”,arraylist);