Wednesday, October 21, 2009

Compile-Time Safe DataBinding

No longer will I have to endure the possibilities that the designer's DataBinding broke when I changed the name of something. Nor will have to fret about leaving string literals to point to a property name. Linq Expressions to the rescue! It doesn't work on XAML, but appears to work for everything else.

It works like this:

dtpRequestDate.BindNullableValue(bsTicket, Member.Name<ModelTicket>(ticket => ticket.AddedDate), false);

Member.Name<ModelTicket>(ticket => ticket.RequestTypeId));

Here's the source:

public static class Member


private static string GetMemberName(Expression expression)


switch (expression.NodeType)


case ExpressionType.MemberAccess:

var memberExpression = (MemberExpression)expression;

var supername = GetMemberName(memberExpression.Expression);

if (String.IsNullOrEmpty(supername))

return memberExpression.Member.Name;

return String.Concat(supername, '.', memberExpression.Member.Name);

case ExpressionType.Call:

var callExpression = (MethodCallExpression)expression;

return callExpression.Method.Name;

case ExpressionType.Convert:

var unaryExpression = (UnaryExpression)expression;

return GetMemberName(unaryExpression.Operand);

case ExpressionType.Parameter:

return String.Empty;


throw new ArgumentException("The expression is not a member access or method call expression");



public static string Name<T>(Expression<Func<T, object>> expression)


return GetMemberName(expression.Body);


public static string Name<T>(Expression<Action<T>> expression)


return GetMemberName(expression.Body);



Thanks to Oliver Hanappi via and this post

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