/// <summary>
/// Rewrites Is expression.
/// </summary>
/// <param name="asExpression">Expression to rewrite.</param>
/// <returns>Expression rewritten as code snippet.</returns>
private CodeSnippetExpression RewriteIsExpression(CodeIsExpression asExpression)
{
using (StringWriter sw = new StringWriter(CultureInfo.InvariantCulture))
{
sw.Write("(");
this.generator.GenerateCodeFromExpression(asExpression.Source, sw, null);
sw.Write(" is ");
this.generator.GenerateCodeFromExpression(asExpression.TargetType, sw, null);
sw.Write(")");
return new CodeSnippetExpression(sw.ToString());
}
}
/// <summary>
/// Rewrites Is expression.
/// </summary>
/// <param name="asExpression">Expression to rewrite.</param>
/// <returns>Expression rewritten as code snippet.</returns>
private CodeSnippetExpression RewriteIsExpression(CodeIsExpression asExpression)
{
using (StringWriter sw = new StringWriter(CultureInfo.InvariantCulture))
{
sw.Write("(");
// VB.net doesn't allow direct comparision of types such as
// c.Id Is Integer
// this needs to be rewritten to :
// Typeof DirectCast(c.Id,Object) Is Integer
// the type comparision operator can only be used on reference types,
// hence the cast to Object before the TypeOf operator is invoked.
sw.Write("TypeOf DirectCast(");
this.generator.GenerateCodeFromExpression(asExpression.Source, sw, null);
sw.Write(" , Object )");
sw.Write(" Is ");
// Handle the CodeTypeReference issue with Byte[]
if (asExpression.TargetType.Type.BaseType == "System.Byte")
{
sw.Write("Byte()");
}
else
{
this.generator.GenerateCodeFromExpression(asExpression.TargetType, sw, null);
}
sw.Write(")");
return new CodeSnippetExpression(sw.ToString());
}
}
