private Func <TFrom, TTo> BuildConversion <TFrom, TTo>()
{
var inputParam = typeof(TFrom).CreateParameterExpression();
var expression = ExpressionGenerator.GenerateConversion(typeof(TTo), inputParam);
if (null == expression)
{
return(null);
}
return(Expression.Lambda <Func <TFrom, TTo> >(expression, inputParam).Compile());
}
private UnaryFunc BuildUnaryFunc <TReturn>(string expressionName)
{
Contract.Requires(!string.IsNullOrEmpty(expressionName));
var tParam = typeof(TValue).CreateParameterExpression();
var expression = ExpressionGenerator.Generate(expressionName, tParam);
if (null == expression)
{
return(null);
}
if (typeof(TReturn) != typeof(void) && typeof(TReturn) != expression.Type)
{
expression = ExpressionGenerator.GenerateConversion(typeof(TReturn), expression);
if (null == expression)
{
return(null);
}
}
return(Expression.Lambda <UnaryFunc>(expression, tParam).Compile());
}
private TResult BuildBinaryFunc <TResult, TReturn>(string expressionName) where TResult : class
{
Contract.Requires(!string.IsNullOrEmpty(expressionName));
var tParam0 = typeof(TValue).CreateParameterExpression();
var tParam1 = typeof(TValue).CreateParameterExpression();
var expression = ExpressionGenerator.Generate(expressionName, tParam0, tParam1);
if (null == expression)
{
return(null);
}
if (typeof(TReturn) != typeof(void) && typeof(TReturn) != expression.Type)
{
expression = ExpressionGenerator.GenerateConversion(typeof(TReturn), expression);
if (null == expression)
{
return(null);
}
}
return(Expression.Lambda <TResult>(expression, tParam0, tParam1).Compile());
}
