C# Language
- Getting started with C# Language
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- Yield Keyword
C# Language Expression Trees Create Expression Trees with a lambda expression
Example
Following is most basic expression tree that is created by lambda.
Expression<Func<int, bool>> lambda = num => num == 42;
To create expression trees 'by hand', one should use Expression class.
Expression above would be equivalent to:
ParameterExpression parameter = Expression.Parameter(typeof(int), "num"); // num argument
ConstantExpression constant = Expression.Constant(42, typeof(int)); // 42 constant
BinaryExpression equality = Expression.Equals(parameter, constant); // equality of two expressions (num == 42)
Expression<Func<int, bool>> lambda = Expression.Lambda<Func<int, bool>>(equality, parameter);
