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我有一个Gridview
名为SearchGenericReport
。我想要在Gridview Columns的标题中对图像进行上下排序。但GetSortColumnIndex(string strrCol)
总是返回- value
。所以我不能添加图像。我在这里错过了什么?在gridview标题中排序图像
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,当我快速监视在gridview.Columns - 它在 “enumertaion没有结果” 的结果和一些东西。 及其多年平均值进入For Each循环仅..我已经修改这样的代码 - 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);
}