/// <summary>
/// Extracts the name of the property inside the lambdaexpression
/// - UnaryExpression: Expression{Func{Warrior, object}} unaryObject = w => w.ID; --> ID
/// - MemberExpression: Expression{Func{Warrior, int}} memberInt = w => w.ID; --> ID
/// - BinaryExpression: Expression{Func{Warrior, bool}} binaryInt = w => w.ID == 1; --> ID (Takes the left side and casts to MemberExpression)
/// - BinaryExpression: Expression{Func{Warrior, bool}} binaryInt = w => 1 == w.ID; --> ID (Takes the right side and casts to MemberExpression)
/// - Compiled Expression: Expression{Func{int}} binaryInt = () => 5; --> 5
/// - ToString: Expression{Func{Warrior, bool}} binaryInt = w => 1 == 1; --> w => True
/// </summary>
/// <param name="propertyExpression"></param>
/// <returns></returns>
public static string TryExtractPropertyName(this LambdaExpression propertyExpression)
{
propertyExpression.ArgumentNotNull("propertyExpression");
var memberExpression = propertyExpression.Body as MemberExpression;
if (memberExpression == null)
{
// try get the member from the operand of the unaryexpression
var unary = propertyExpression.Body as UnaryExpression;
if (unary != null)
{
memberExpression = unary.Operand as MemberExpression;
}
if (memberExpression == null)
{
var binary = propertyExpression.Body as BinaryExpression;
if (binary != null)
{
memberExpression = binary.Left as MemberExpression;
if (memberExpression == null)
{
memberExpression = binary.Right as MemberExpression;
}
}
}
if (memberExpression == null)
{
LogDelegate.TraceLine("## PersistenceMap - Property is not a MemberAccessExpression: {0}", propertyExpression.ToString());
try
{
return(propertyExpression.Compile().DynamicInvoke().ToString());
}
catch (Exception e)
{
LogDelegate.TraceLine(e.Message);
return(propertyExpression.ToString());
}
}
}
var propertyInfo = memberExpression.Member as PropertyInfo;
if (propertyInfo == null)
{
LogDelegate.TraceLine(string.Format("## PersistenceMap - Property {0} is not a PropertyInfo", memberExpression.Member));
return(memberExpression.Member.ToString());
}
if (propertyInfo.GetGetMethod(true).IsStatic)
{
LogDelegate.TraceLine(string.Format("## PersistenceMap - Property {0} is static", memberExpression.Member.Name));
return(memberExpression.Member.Name);
}
return(memberExpression.Member.Name);
}
/// <summary>
/// Extracts the type of the property inside the lambdaexpression or of the return value
/// - UnaryExpression: Expression{Func{Warrior, object}} unaryObject = w => w.ID; --> int
/// - MemberExpression: Expression{Func{Warrior, int}} memberInt = w => w.ID; --> int
/// - BinaryExpression: Expression{Func{Warrior, bool}} binaryInt = w => w.ID == 1; --> int (Takes the left side and casts to MemberExpression)
/// - BinaryExpression: Expression{Func{Warrior, bool}} binaryInt = w => 1 == w.ID; --> int (Takes the right side and casts to MemberExpression)
/// - Compiled Expression: Expression{Func{int}} binaryInt = () => 5; --> int
/// - Compiled Expression: Expression{Func{Warrior, bool}} binaryInt = w => 1 == 1; --> bool
/// </summary>
/// <param name="propertyExpression"></param>
/// <returns></returns>
public static Type TryExtractPropertyType(this LambdaExpression propertyExpression)
{
propertyExpression.ArgumentNotNull("propertyExpression");
var memberExpression = propertyExpression.Body as MemberExpression;
if (memberExpression == null)
{
// try get the member from the operand of the unaryexpression
var unary = propertyExpression.Body as UnaryExpression;
if (unary != null)
{
memberExpression = unary.Operand as MemberExpression;
}
if (memberExpression == null)
{
var binary = propertyExpression.Body as BinaryExpression;
if (binary != null)
{
memberExpression = binary.Left as MemberExpression;
if (memberExpression == null)
{
memberExpression = binary.Right as MemberExpression;
}
}
}
if (memberExpression == null)
{
try
{
return(propertyExpression.Compile().DynamicInvoke().GetType());
}
catch (Exception e)
{
LogDelegate.TraceLine(e.Message);
return(propertyExpression.Body.Type);
}
}
}
return(memberExpression.Type);
}