CODEWITHSUNDEEP
silverlightbinding
Manish Nair
Manish Nair

Reputation: 21

Silverlight datagrid runtime adding and binding

I need to add columns to silverlight columns at runtime and also perform the bindings for the columns.

This is how i do it statically in xaml

<sdk:DataGridTextColumn  CanUserReorder="True" CanUserResize="True" CanUserSort="True"  Header="CriteriaName" Width="2*" Binding="{Binding Path=[CriteriaName]}" IsReadOnly="True"  />

Now i want do the same in code behind,

here is what i have done 

 foreach(string Col in lColumnNames)
            {
                DataGridTextColumn DGCol=new DataGridTextColumn();
                DGCol.Header= Col;


                Binding lObjBinding = new Binding(Col);
                lObjBinding.Mode = BindingMode.OneWay;

                DGCol.Binding = lObjBinding;
                GrdQuickFindResult.Columns.Add(DGCol);


            }

This is not working.All i can see are blank rows in the DataGrid,as if the binding hasn't happened. Pls check and tell me if all the things that i have done using xaml is done using C# as well or is there some property that is left to be set in the Binding Object that i have created. Thanx

Upvotes: 0

Views: 716

Answers (2)

Arthur Nunes
Arthur Nunes

Reputation: 7058

A binding like:

"{Binding Path=MyProperty}"

is just a verbose way of writing:

"{Binding MyProperty}"

In the same way that

Binding b = new Binding();

is the same as

Binding b = new Binding("MyProperty");

And means that you are binding the text of your TextBoxColumn to the value of the property "MyProperty" in the data object which will be set as DataContext of a row in your DataGrid. For this we are assuming your data object is something like:

public class DataObject{
    public object MyProperty {get; set;}
}

If your data objects are like that, your bindings in code behind are fine and they should work.

When you especify a binding like:

"{Binding Path=[MyProperty]}"

Or

"{Binding [MyProperty]}"

You are binding the the indexer of the data object (if it implements one) and acessing the value corresponding to the the index "MyProperty". If you do this, I assume your data object is a IDictionary or a class which implements a indexer, like:

public class DataObject{
    public object this[object index]
    {
        get{ /*return something*/ }
        set { /*set something*/ }
    }
}

Just a suggestion: use camel case for your local variables, it looks strange for other people looking at your code, seems they are instance properties or static fields.

Upvotes: 1

Manish Nair
Manish Nair

Reputation: 21

 foreach(string Col in lColumnNames)
            {
                DataGridTextColumn DGCol=new DataGridTextColumn();
                DGCol.Header= Col;

                Binding lObjBinding = new Binding();
                lObjBinding.Mode = BindingMode.OneWay;

                //=====This is what was missing======================//
                lObjBinding.Path = new PropertyPath("["+Col+"]");
                //==================================================//

                DGCol.Binding = lObjBinding;
                GrdQuickFindResult.Columns.Add(DGCol);


            }

Upvotes: 0

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