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Public Overrides Function ConvertTo( _ ByVal context As ITypeDescriptorContext, ByVal culture As CultureInfo, _ ByVal value As Object, ByVal destinationType As Type) As Object If destinationType Is GetType(String) Then Return ConvertToString(value) Else Return MyBase.ConvertTo(context, culture, value, destinationType) End If End Function The ToString() method builds the required string representation: Public Overloads Function ConvertToString(ByVal value As Object) As String Dim fill As GradientFill = CType(value, GradientFill) Dim converter As New ColorConverter() Return String.Format("{0}, {1}, {2}", converter.ConvertToString(fill.ColorA), _ converter.ConvertToString(fill.ColorB), fill.GradientFillStyle) End Function Notice that this method makes use of the ColorConverter an existing type converter that transforms colors into strings and back. This saves some work when converting the GradientFill object. If you have a data type that has a type converter, but you don t know what the type converter class is, you can use the shared TypeDescriptor.GetConverter() method. Here s an example: Dim converter As TypeConverter = TypeDescriptor.GetConverter(GetType(Color)) Once you have the converter, you can call its ConvertToString() or ConvertFromString() method. The exact same process occurs in reverse when converting a GradientFill object to a string. First the Properties window calls CanConvertFrom(). If it returns True, the next step is to call the ConvertFrom() method. Public Overrides Function CanConvertFrom(ByVal context As ITypeDescriptorContext, _ ByVal sourceType As Type) As Boolean If sourceType Is GetType(String) Then Return True Else Return MyBase.CanConvertFrom(context, sourceType) End If End Function Public Overrides Function ConvertFrom(ByVal context As ITypeDescriptorContext, _ ByVal culture As CultureInfo, ByVal value As Object) As Object If TypeOf value Is String Then Return ConvertFromString(value) Else return MyBase.ConvertFrom(context, culture, value) End If End Function

The ConvertFromString() method does the actual work of decoding the string representation. If the string isn t in the format you need, the ConvertFromString() code raises an exception. Otherwise, it returns the new GradientFill object instance. Public Overloads Function ConvertFromString(ByVal value As Object) As GradientFill Dim values() As String = CStr(value).Split(",") If values.Length <> 3 Then Throw New ArgumentException("Could not convert the value") End If Try Dim gradient As New GradientFill() ' Retrieve the colors. Dim converter As New ColorConverter() gradient.ColorA = CType(converter.ConvertFromString(values(0)), Color) gradient.ColorB = CType(converter.ConvertFromString(values(1)), Color) ' Convert the name of the enumerated value into the corresponding ' enumerated value (which is actually an integer constant). gradient.GradientFillStyle = CType(System.Enum.Parse( _ GetType(LinearGradientMode), values(2), True), LinearGradientMode) Return gradient Catch err As Exception Throw New ArgumentException("Could not convert the value") End Try End Function Now that you have a fully functioning type converter, the next step is to attach it to the corresponding property.

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So far, all of the examples in this chapter involved using LINQ and objects. However, LINQ is not just an object-searching technology. It is also usable with XML and relational databases. Using LINQ with these other data sources is not a problem, since the querying is identical. What is a problem is getting the query to work in the first place. Consider Figure 15-1, which illustrates the LINQ architecture.

while (List.length !matsuoBasho > 0) do printf "%s " (List.head !matsuoBasho) matsuoBasho := List.tail !matsuoBasho This program enumerates list, and the Boolean expression to terminate the loop is based on whether the list is empty. Within the body of the loop, you print the head of the list and then remove it, shortening the list on each iteration. When you compile and execute this code, you get the following results: An old pond! A frog jumps in- The sound of water

There are two ways to attach a type converter. The approach you should use in most cases is to link the custom type to the type converter by adding the TypeConverter attribute to the class declaration. <TypeConverter(GetType(GradientFillConverter))> _ Public Class GradientFill ... End Class Another option is to apply the TypeConverter attribute to the property in your custom control. This option is most suitable if your control needs to serialize a nested object in a different way than usual.

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