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AutoGenerateColumns property automatically generate columns for display in UI from the bounded data source.

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It takes every public property in bounded data source to generate columns. For example, if you bind to below Employee class to DataGrid:

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Thanks but the number of columns for the names should be dynamic. It could be more than 3. – for-each Jun 23 '14 at 8:17 Simple and easy solution, but the grid's not editable. – icebat Jun 23 '14 at 8:24. How to bind Dictionary to Silverlight Datagrid Hi friends How can i bind a List to silverlight datagrid where as the dictionary is generated a. I need the keys as columns and values as row of a dictionary Any help highly appreciable. So i need to create columns runtime and assing the values of a dictionary as rows for the keys of. C# Dictionary class constructor takes a key data type and a value data type. Both types are generic so it can be any.NET data type. The following Dictionary class is a generic class and can store any data types. This class is defined in the code snippet creates a dictionary where both keys and values are string types. DataTemplate is about the presentation of data and is one of the many features provided by the WPF styling and templating model. For an introduction of the WPF styling and templating model, such as how to use a Style to set properties on controls, see the Styling and Templating topic. The Idea was to Bind DataGrid to ObservableCollection ServerRows;, and then generate the Columns depending on the ServerRow object which has ServerColumns which in turn have Name (should be a header of the column), Type as the datatype of column data, and Value as the value which should be represented in every row/column.

Only one column is generated for Property4 in the DataGrid because it has public modifier. Rest all properties and variables are ignored.

Set DataGrid AutoGenerateColumns Property

You can set AutoGenerateColumns property in DataGrid both in XAML and code-behind class.

Type of Generated Columns

By default DataGrid based on the column type generate columns. For example, if you bind to a bool property, then it will generate a checkbox column.

Below is table of data type mapping:

AutoGenerateColumn Example

Below is full example of DataGrid auto generation of columns:

In the above code, we have create a new DataGrid name 'myDataGrid' and set AutoGenerateColumns property to True.

In the code-behind class, we have create a class 'Employee' which has properties of different types like int, string, bool, enum, Uri, DateTime. Then we have created an ObservableCollection of Employee class and create three sample employee type and bind ObservableCollection to DataGrid in the ItemsSource property.

Events

DataGrid provides two events for auto generate columns process.

1. AutoGeneratingColumn
2. AutoGeneratedColumns

AutoGeneratingColumn event

This event provides DataGridAutoGeneratingColumnEventArgs event argument which contains three important properties:

1. Cancel - For cancel the column to be generated
2. Column - Generated column
3. PropertyName - Get the name of property bound to generated column

You can use this event for two important tasks:

1. Remove the column from the being created
2. Change/Update the header of generated column

Below is the example of both:

In the above code, I have checked the PropertyName of event argument. If PropertyName is 'ID' then set e.Cancel to true. Then ID column will not be generated.

I have also changed the header of Name column by changed the Header property of Column property of event argument.

AutoGeneratedColumns event

This event occurs when the auto completion process is completed by the DataGrid.

By this event, datagrid Colums property is filled with the generated columns and you can modify any generated column by giving index to Columns property.

The WPF data templating model provides you with great flexibility to define the presentation of your data. WPF controls have built-in functionality to support the customization of data presentation. This topic first demonstrates how to define a DataTemplate and then introduces other data templating features, such as the selection of templates based on custom logic and the support for the display of hierarchical data.

Prerequisites

This topic focuses on data templating features and is not an introduction of data binding concepts. For information about basic data binding concepts, see the Data Binding Overview.

DataTemplate is about the presentation of data and is one of the many features provided by the WPF styling and templating model. For an introduction of the WPF styling and templating model, such as how to use a Style to set properties on controls, see the Styling and Templating topic.

In addition, it is important to understand Resources, which are essentially what enable objects such as Style and DataTemplate to be reusable. For more information on resources, see XAML Resources.

Data Templating Basics

To demonstrate why DataTemplate is important, let's walk through a data binding example. In this example, we have a ListBox that is bound to a list of Task objects. Each Task object has a TaskName (string), a Description (string), a Priority (int), and a property of type TaskType, which is an Enum with values Home and Work.

Without a DataTemplate

Without a DataTemplate, our ListBox currently looks like this:

What's happening is that without any specific instructions, the ListBox by default calls ToString when trying to display the objects in the collection. Therefore, if the Task object overrides the ToString method, then the ListBox displays the string representation of each source object in the underlying collection.

For example, if the Task class overrides the ToString method this way, where name is the field for the TaskName property:

Then the ListBox looks like the following:

However, that is limiting and inflexible. Also, if you are binding to XML data, you wouldn't be able to override ToString.

Defining a Simple DataTemplate

The solution is to define a DataTemplate. One way to do that is to set the ItemTemplate property of the ListBox to a DataTemplate. What you specify in your DataTemplate becomes the visual structure of your data object. The following DataTemplate is fairly simple. We are giving instructions that each item appears as three TextBlock elements within a StackPanel. Each TextBlock element is bound to a property of the Task class.

The underlying data for the examples in this topic is a collection of CLR objects. If you are binding to XML data, the fundamental concepts are the same, but there is a slight syntactic difference. For example, instead of having Path=TaskName, you would set XPath to @TaskName (if TaskName is an attribute of your XML node).

Now our ListBox looks like the following:

Creating the DataTemplate as a Resource

In the above example, we defined the DataTemplate inline. It is more common to define it in the resources section so it can be a reusable object, as in the following example:

Now you can use myTaskTemplate as a resource, as in the following example:

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Because myTaskTemplate is a resource, you can now use it on other controls that have a property that takes a DataTemplate type. As shown above, for ItemsControl objects, such as the ListBox, it is the ItemTemplate property. For ContentControl objects, it is the ContentTemplate property.

The DataType Property

The DataTemplate class has a DataType property that is very similar to the TargetType property of the Style class. Therefore, instead of specifying an x:Key for the DataTemplate in the above example, you can do the following:

This DataTemplate gets applied automatically to all Task objects. Note that in this case the x:Key is set implicitly. Therefore, if you assign this DataTemplate an x:Key value, you are overriding the implicit x:Key and the DataTemplate would not be applied automatically.

If you are binding a ContentControl to a collection of Task objects, the ContentControl does not use the above DataTemplate automatically. This is because the binding on a ContentControl needs more information to distinguish whether you want to bind to an entire collection or the individual objects. If your ContentControl is tracking the selection of an ItemsControl type, you can set the Path property of the ContentControl binding to '/' to indicate that you are interested in the current item. For an example, see Bind to a Collection and Display Information Based on Selection. Otherwise, you need to specify the DataTemplate explicitly by setting the ContentTemplate property.

The DataType property is particularly useful when you have a CompositeCollection of different types of data objects. For an example, see Implement a CompositeCollection.

Adding More to the DataTemplate

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Currently the data appears with the necessary information, but there's definitely room for improvement. Let's improve on the presentation by adding a Border, a Grid, and some TextBlock elements that describe the data that is being displayed.

The following screenshot shows the ListBox with this modified DataTemplate:

We can set HorizontalContentAlignment to Stretch on the ListBox to make sure the width of the items takes up the entire space:

With the HorizontalContentAlignment property set to Stretch, the ListBox now looks like this:

Use DataTriggers to Apply Property Values

The current presentation does not tell us whether a Task is a home task or an office task. Remember that the Task object has a TaskType property of type TaskType, which is an enumeration with values Home and Work.

In the following example, the DataTrigger sets the BorderBrush of the element named border to Yellow if the TaskType property is TaskType.Home.

Our application now looks like the following. Home tasks appear with a yellow border and office tasks appear with an aqua border:

In this example the DataTrigger uses a Setter to set a property value. The trigger classes also have the EnterActions and ExitActions properties that allow you to start a set of actions such as animations. In addition, there is also a MultiDataTrigger class that allows you to apply changes based on multiples add the following DataTemplate to the resources section:

This example uses the DataTemplate.Resources property. Resources defined in that section are shared by the elements within the DataTemplate.

To supply logic to choose which DataTemplate to use based on the Priority value of the data object, create a subclass of DataTemplateSelector and override the SelectTemplate method. In the following example, the SelectTemplate method provides logic to return the appropriate template based on the value of the Priority property. The template to return is found in the resources of the enveloping Window element.

We can then declare the TaskListDataTemplateSelector as a resource:

To use the template selector resource, assign it to the ItemTemplateSelector property of the ListBox. The ListBox calls the SelectTemplate method of the TaskListDataTemplateSelector for each of the items in the underlying collection. The call passes the data object as the item parameter. The DataTemplate that is returned by the method is then applied to that data object.

With the template selector in place, the ListBox now appears as follows:

This concludes our discussion of this example. For the complete sample, see Introduction to Data Templating Sample.

Styling and Templating an ItemsControl

Even though the ItemsControl is not the only control type that you can use a DataTemplate with, it is a very common scenario to bind an ItemsControl to a collection. In the What Belongs in a DataTemplate section we discussed that the definition of your DataTemplate should only be concerned with the presentation of data. In order to know when it is not suitable to use a DataTemplate it is important to understand the different style and template properties provided by the ItemsControl. The following example is designed to illustrate the function of each of these properties. The ItemsControl in this example is bound to the same Tasks collection as in the previous example. For demonstration purposes, the styles and templates in this example are all declared inline.

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The following is a screenshot of the example when it is rendered:

Note that instead of using the ItemTemplate, you can use the ItemTemplateSelector. Refer to the previous section for an example. Similarly, instead of using the ItemContainerStyle, you have the option to use the ItemContainerStyleSelector.

Two other style-related properties of the ItemsControl that are not shown here are GroupStyle and GroupStyleSelector.

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Support for Hierarchical Data

So far we have only looked at how to bind to and display a single collection. Sometimes you have a collection that contains other collections. The HierarchicalDataTemplate class is designed to be used with HeaderedItemsControl types to display such data. In the following example, ListLeagueList is a list of League objects. Each League object has a Name and a collection of Division objects. Each Division has a Name and a collection of Team objects, and each Team object has a Name.

The example shows that with the use of HierarchicalDataTemplate, you can easily display list data that contains other lists. The following is a screenshot of the example.

See also