Hello Michael,

Thanks for the follow up.

I am using Xamarin.Forms.

Here is the sample code snippet: 

xamDataGrid.ItemsSource = listData; // where listData is ObservableCollection<Dictionary<string, string>>

xamDataGrid.Columns.Add(new TextColumn
{
HeaderText = "header1",
PropertyPath = "[key1]"

});

xamDataGrid.Columns.Add(new TextColumn
{
HeaderText = "header2",
PropertyPath = "[key2]"

});

xamDataGrid.Columns.Add(new TextColumn
{
HeaderText = "header3",
PropertyPath = "[key3]"

});

xamDataGrid.SortDescriptions.Add(new ColumnSortDescription{ PropertyPath = "[key1]", SortDirection = ListSortDirection.Ascending });

I tried your approach above where you add a column manually then apply a sort and I didn't get an exception. Please modify my sample to align with your requirement that demonstrates the behavior and I will be happy to look into this for you. Thanks. 

Hi,

I modified your sample app as per my requirements, but I'm facing Object reference not set to an instance of object exception.

Here is the code snippet for the same.

DataGrid.Columns.Add(new TextColumn
{
HeaderText = "header1",
PropertyPath = "[key1]"

});
ObservableCollection<Dictionary<string, string>> keyValuePairs = new ObservableCollection<Dictionary<string, string>>();
Dictionary<string, string> keyValues1 = new Dictionary<string, string>();
keyValues1.Add("key1", "abc");
keyValuePairs.Add(keyValues1);
Dictionary<string, string> keyValues2 = new Dictionary<string, string>();
keyValues2.Add("key1", "xyz");
keyValuePairs.Add(keyValues2);
DataGrid.ItemsSource = keyValuePairs;
var description1 = new ColumnSortDescription
{
PropertyPath = "[key1]",
SortDirection = ListSortDirection.Descending
};
DataGrid.SortDescriptions.Add(description1);

Kindly suggest the required changes to make the code working.

Thanks.

I am not able to reproduce this. Please modify my sample above and reattach it here. Thanks.

Hi,

Thanks for your support.

I have tried it  in a new project as well as in your sample application and I'm getting the same error (NullReference exception at "DataGrid.SortDescriptions.Add(description1)" line).

Since, you are not able to reproduce the error after trying out my problem statement in your sample project and its working fine for you.

Is it possible for you to share that working project (using list of dictionaries) with me.