Supporting Designer Initialization of Data Binding in .NET

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Supporting Designer Initialization of Data Binding
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You want your DataSource and DataMember properties to behave just like those of the built-in Windows Forms controls, letting you select data sources and members using the graphical pop-up windows that allow browsing of project data sources, as described in 5 To do this, you need to adorn these properties with some attributes that let the designer know how to treat them in the designer
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Add the AttributeProvider attribute to the DataSource property and the Editor attribute to the DataMember with the appropriate arguments This lets you tell the designer to treat your properties just like the Framework controls DataSource and DataMember properties get treated
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[AttributeProvider(typeof(IListSource))] public object DataSource { get { return m_BindingSourceDataSource; } set { m_BindingSourceDataSource = value; } } [Editor("SystemWindowsFormsDesignDataMemberListEditor, SystemDesign, Version=2000, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a", typeof(UITypeEditor))] public string DataMember { get { return m_BindingSourceDataMember; } set { m_BindingSourceDataMember = value; } }
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Add a using statement to bring in the SystemDrawingDesign namespace for the UITypeEditor type name
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Just by adding these attributes and rebuilding the control library, now when you work with the FilteredGrid control in a form's designer, you get the same drag-and-drop data-binding experience as you do for a DataGridView, ComboBox, or any of the other data-bound Framework controls, as shown in Figure 87 You may need to close and reopen the form you are editing the FilterGrid on after rebuilding the solution to see the Properties window changes
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Figure 87 Setting DataSource and DataMember Properties on the FilteredGrid Control
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This gets you the interaction you are looking for in the Properties window, but if you try to drag and drop a data source from the Data Sources window, you will still get a mouse cursor indicating the drop is not allowed (circle with a slash) To remedy this, you need to add an appropriate binding attribute to the class itself
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Specifying Binding Properties on a Control
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When you want the designer to be able to set up data bindings for your control through drag-and-drop operations, the designer needs to know whether your control is designed for simple or complex data binding and which properties on the control it is supposed to be setting in response to drag-and-drop operations To identify these items on a custom control that you want to use through the Data Sources window, you have to add an appropriate attribute to the control class definition so that the Data Sources window can work with it The attributes used are described in Table 81
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Table 81 Data Sources Binding Attributes
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Attribute DefaultBindingProperty Control Type Simple bound control Description Identifies the name of the property on the control that will be used as the default for binding This property type has to match the type of the data member it is used for, or a suitable type converter has to be available, or the data binding will fail at runtime Identifies the control's properties that should be used as the data source, display member, value member, and selected item Identifies the control's properties that should be used as the data source and data member
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LookupBindingProperties
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Lookup complex bound control
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ComplexBindingProperties
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Table-oriented complex bound control
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Because your FilteredGrid control represents a complex bound control, you need to add aComplexBindingProperties attribute to the class itself: [ComplexBindingProperties("DataSource", "DataMember")] public partial class FilteredGrid : UserControl, ISupportInitialize { }
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The two parameters of this attribute's constructor specify the names of the properties for setting the data source and data member, respectively, on the control I recommend that you stick to the convention of naming these DataSource and DataMember, respectively, which is what is done in the FilteredGrid control Now you should be able to drag and drop data sources from the Data Sources window onto the control, and the designer will generate all the appropriate objects (typed data set, table adapter, binding source, and data navigator in the case of a typed data set source) and hook them up to your DataSource and DataMember properties appropriately
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