我有一个Gridview名为SearchGenericReport. 我想在 Gridview Columns 的标题中对图像进行上下排序。但GetSortColumnIndex(string strrCol)总是回报- value。所以我不能添加图像。我在这里想念什么？
public int GetSortColumnIndex(String strCol)
{
DataTable result= Session["TaskTable"] as DataTable;
foreach (DataControlField field in result.Columns)
{
if (field.SortExpression == strCol)
{
return SearchGenericReport.Columns.IndexOf(field);
}
}
return -1;
}
void AddSortImage(GridViewRow headerRow)
{
int selCol = GetSortColumnIndex(m_strSortExp);
//if (-1 == selCol)
//{
// return;
//}
// Create the sorting image based on the sort direction
Image sortImage = new Image();
if (SortDirection.Ascending == m_SortDirection)
{
sortImage.ImageUrl = "img/uparrow.png";
sortImage.AlternateText = "Ascending";
}
else
{
sortImage.ImageUrl = "img/downarrow.png";
sortImage.AlternateText = "Descending";
}
// Add the image to the appropriate header cell
headerRow.Cells[selCol].Controls.Add(sortImage);
}
但是当我在 gridview.Columns 上快速观看时 - 它的结果是“枚举没有结果”等等。而且它不会只进入 For Each 循环。我已经修改了这样的代码 - int GetSortColumnIndex() {
// Iterate through the Columns collection to determine the index
// of the column being sorted.
foreach (DataControlField field in this.SearchGenericReport.Columns)
{
if (field.SortExpression == SearchGenericReport.SortExpression)
{
return SearchGenericReport.Columns.IndexOf(field);
}
}
return -1;
}
void AddSortImage(int columnIndex,GridViewRow headerRow)
{
// Create the sorting image based on the sort direction
Image sortImage = new Image();
SortDirection direction = SearchGenericReport.SortDirection;
if (direction == SortDirection.Ascending)
{
sortImage.ImageUrl = "img/uparrow.png";
sortImage.AlternateText = "Ascending";
}
else
{
sortImage.ImageUrl = "img/downarrow.png";
sortImage.AlternateText = "Descending";
}
// Add the image to the appropriate header cell
headerRow.Cells[columnIndex].Controls.Add(sortImage);
}