Data in DataTable can be sorted using string column name
DataView dv = new DataView(ds.Tables[0], "","SortExpression" + " " + "SortDirection", DataViewRowState.CurrentRows);
For list we cannot pass sort expression and direction in
string format. We have to find the column using reflection and then sort the
column as given below
PropertyInfo pi = typeof(Employee).GetProperty("[ColumnName]");
lstData.OrderBy(i =>
pi.GetValue(i, null)).ToList();
Given below is an example in ASP.NET
-------------------------------------------------------------
HTML (Add inside ‘form’ tags)
<asp:DropDownList runat="server" ID="ddlSortColumn"></asp:DropDownList>
<asp:DropDownList runat="server" ID="ddlSortDirection">
<asp:ListItem Text="asc"></asp:ListItem>
<asp:ListItem Text="desc"></asp:ListItem>
</asp:DropDownList>
<asp:Button runat="server" ID="btnReport" Text="Report"
onclick="btnReport_Click" />
<br />
<asp:GridView runat="server" ID="grvData"></asp:GridView>
C# (CodeBehind)
protected
void Page_Load(object
sender, EventArgs e)
{
if
(!IsPostBack)
{
IList<PropertyInfo> props = new
List<PropertyInfo>(typeof(Employee).GetProperties());
ddlSortColumn.DataSource =
props;
ddlSortColumn.DataTextField = "Name";
ddlSortColumn.DataValueField = "Name";
ddlSortColumn.DataBind();
grvData.DataSource = GetData();
grvData.DataBind();
}
}
protected
void btnReport_Click(object
sender, EventArgs e)
{
PropertyInfo
pi = typeof(Employee).GetProperty(ddlSortColumn.SelectedValue);
if
(ddlSortDirection.SelectedItem.Text == "asc")
{
grvData.DataSource =
GetData().OrderBy(i => pi.GetValue(i, null)).ToList();
}
else
{
grvData.DataSource =
GetData().OrderByDescending(i => pi.GetValue(i, null)).ToList();
}
grvData.DataBind();
}
public List<Employee>
GetData()
{
List<Employee> employees = new
List<Employee>();
employees.Add(new Employee() {
Id = 1, Name = "Employee 1", Age =
25 });
employees.Add(new Employee() {
Id = 2, Name = "Employee 2", Age =
35 });
employees.Add(new Employee() {
Id = 3, Name = "Employee 3", Age =
39 });
return
employees;
}
public class Employee
{
public
int Id { get; set; }
public
string Name { get;
set; }
public
int Age { get; set; }
}
