Feb 21, 2012  I have an object which contains some fields and a dictionary - I want to bind each value in the dictionary to a column in a radgrid. I don't know what these keys/values will be until the item comes back, and they'll change depending on the source of the query.

Introduction

Since .NET 4.0, Microsoft is shipping a DataGrid control that provides all the basic functionality needed, like:

Basic usage: Auto generate columns

To show a basic data grid , just drop a DataGrid control to your view and bind the ItemsSource to a collection of data objects and you're done. The DataGrid provides a feature called AutoGenerateColumns that automatically generates column according to the public properties of your data objects. It generates the following types of columns:

• TextBox columns for string values
• CheckBox columns for boolean values
• ComboBox columns for enumerable values
• Hyperlink columns for Uri values

Manually define columns

Alternatively you can define your columns manually by setting the AutoGenerateColumns property to False. In this case you have to define the columns in the Columns collection of the data grid. You have the following types of columns available:

• DataGridCheckBoxColumn for boolean values
• DataGridComboBoxColumn for enumerable values
• DataGridHyperlinkColumn for Uri values
• DataGridTemplateColumn to show any types of data by defining your own cell template
• DataGridTextColumn to show text values

Selection

The data grid includes a variety of selection modes. They are configured by the SelectionMode and SelectionUnit property.

• The SelectionMode can be set to Single or Extended to define if one or multiple units can be selected simultaneously.
• The SelectionUnit defines the scope of one selection unit. It can be set to Cell, CellAndRowHeader and FullRow.

Column sorting, reordering and resizing

The data grid provides features to sort, reorder and resize columns. They can be enabled or disabled by the following properties:

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• CanUserReorderColumns enables or disables column re-ordering
• CanUserResizeColumns enables or disables column resizing
• CanUserResizeRows enables or disables row resizing
• CanUserSortColumns enables or disables column sorting

Grouping

The data grid also supports grouping. To enable grouping you have to define a CollectionView that contains to least one GroupDescription that defines the criterias how to group.

Second thing you need to do is defining a template how the groups should look like. You can do this by setting the GroupStyle to something like the following snippet.

Row Details

The data grid provides a feature that shows a detail panel for a selected row. It can be enabled by setting a DataTemplate to the RowDetailsTemplate property. The data template gets the object that is bound to this row passed by the DataContext and can bind to it.

Row Details depending on the type of data

You can specify a RowDetailsTemplateSelector that selects a data template according to the type or data that this row contains. To do this, create a type that derives from DataTemplateSelector and override the SelectTemplate method. In the items argument you get the data and you can determine which data template to display. Return an instance of that data template as return value.

Alternating BackgroundBrush

You can define a an AlternatingRowBackground that is applied every even row. You can additionally specify an AlternationCount if you only want to ink every every n-th data row.

Frozen Columns

The data grid also supports the feature to freeze columns. That means they stay visible while you scoll horizontally through all columns. This is a useful feature to keep a referencing column like an ID or a name always visible to keep your orientation while scrolling.

To freeze a numer of columns just set the FrozenColumnCount property to the number of columns you want to freeze.

Headers visbility

You can control the visibility of row and column headers by setting the HeadersVisibility property to either None,Row,Column or All

How to template autogenerated columns

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If you want to autogenerate columns using AutoGenerateColumns='True', you cannot use CellTemplates, because the DataGrid autogenerates either a text, combo, hyperlink or checkbox column, but none of these are templateable. A simple workaround is to hook into the autogeneration, cancel it and always create a DataGridTemplateColumn. The following snippet shows the idea (the code is just a draft):

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Comments on this article

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

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

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. https://luckyson.netlify.app/appc-generating-developer-certificate-and-private-public-keys.html.

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.

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Below is table of data type mapping:

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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.

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Events

DataGrid provides two events for auto generate columns process.

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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.

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AutoGeneratedColumns event

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

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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.