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<ColumnDefinition Width="40"></ColumnDefinition> Cells set with absolute sizing remain the same size regardless of whether the Grid changes size.

oi, j);

Although in this book I am mainly covering C#, for completeness I will cover changes to VB.NET as well.

The following markup creates three row definitions and three column definitions. The first row is set with an absolute height of 60. The first two columns are set with widths of 35 and 150, respectively.

This code produces the following output: i: 10, oi: 10, j: 10

One of the aspects of VB.NET I really hated was the line continuation character (an underscore with a space before it). This particularly annoyed me when writing LINQ queries, because it made them less readable and the underscore character is kind of awkward to type (okay that s not that big an issue): Dim numbers() As Integer = {1, 2, 3, 4, 5} Dim query = from n in numbers _ Select n _ Where n>5 In .NET 4.0, in the majority of situations, this will no longer be necessary, as the compiler is now clever enough to work out how lines will be split. This then allows the above LINQ query to be rewritten without the underscore character: Dim query = from n in numbers Select n Where n>5 You can of course continue to use the line continuation character in your code so you will not have to do any modifications to existing projects. You may also need to use it in the unlikely situation the compiler cannot infer where a line break exists.

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Attempting to unbox a value to a type other than the original type raises an InvalidCastException exception.

<Grid.RowDefinitions> <RowDefinition Height="60"></RowDefinition> <RowDefinition></RowDefinition> <RowDefinition></RowDefinition> </Grid.RowDefinitions> Set Absolute Width <Grid.ColumnDefinitions> <ColumnDefinition Width="35"></ColumnDefinition> <ColumnDefinition Width="150"></ColumnDefinition> <ColumnDefinition></ColumnDefinition> </Grid.ColumnDefinitions>

According to Microsoft, the inferred line continuation works in the following situations: After an attribute. After a comma. After a dot (such as for method invocation). After a binary operator. After a LINQ query clause.

Besides the standard conversions, you can also define both implicit and explicit conversions for your own classes and structs. The syntax for user-defined conversions is shown following. The syntax is the same for both implicit and explicit conversion declarations, except for the keywords implicit and explicit. The modifiers public and static are required. Keyword Source TargetType ( SourceType Identifier )

Required Operator public static implicit operator { Implicit or explicit ... return ObjectOfTargetType; }

Anonymous methods allow you to declare an inline function and can make code more readable. This can be done as follows (note how we don t need line continuation underscores): Dim add = Function(x as integer, y as integer) Return x+y End function

Figure 5-21 shows a window with a Grid containing the row and column structure of the previous code sample.

For example, the following shows an example of the syntax of a conversion method that converts an object of type Person to an int: public static implicit operator int(Person p) { return p.Age; }

It is very common to need to create private variables with public accessor methods. In VB.NET you probably have written something like the following (although bet you haven t had the need to create a Tiger class): Public Class Tiger Private _Name As String Property Name() As String Get Return _Name End Get Set(ByVal Name As String) _Name = Name End Set End Property End Class You can now use the following syntax to get the compiler to generate a private backing field like in C#: Public Class AdvancedTiger Property Name() As String End Class The old syntax is of course still supported.

Figure 5-21. You can set the absolute sizes of Grid cells by setting the Height and Width properties of the rows and columns. When you change the size of the window containing this Grid, the three measurements set with absolute sizing don t change, regardless of the rest of the dimensions, as shown in Figure 5-22. Notice that the other dimensions, for example the height of Button 2, change with the window size.

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