public static bool TryParsePath(Expression expression, out string path)
{
path = (string)null;
Expression expression1 = expression.RemoveConvert();
MemberExpression memberExpression = expression1 as MemberExpression;
MethodCallExpression methodCallExpression = expression1 as MethodCallExpression;
if (memberExpression != null)
{
string name = memberExpression.Member.Name;
string path1;
if (!DbHelpers.TryParsePath(memberExpression.Expression, out path1))
{
return(false);
}
path = path1 == null ? name : path1 + "." + name;
}
else if (methodCallExpression != null)
{
string path1;
if (methodCallExpression.Method.Name == "Select" && methodCallExpression.Arguments.Count == 2 && (DbHelpers.TryParsePath(methodCallExpression.Arguments[0], out path1) && path1 != null))
{
LambdaExpression lambdaExpression = methodCallExpression.Arguments[1] as LambdaExpression;
string path2;
if (lambdaExpression != null && DbHelpers.TryParsePath(lambdaExpression.Body, out path2) && path2 != null)
{
path = path1 + "." + path2;
return(true);
}
}
return(false);
}
return(true);
}
public static string ParsePropertySelector <TEntity, TProperty>(
Expression <Func <TEntity, TProperty> > property,
string methodName,
string paramName)
{
string path;
if (!DbHelpers.TryParsePath(property.Body, out path) || path == null)
{
throw new ArgumentException(Strings.DbEntityEntry_BadPropertyExpression((object)methodName, (object)typeof(TEntity).Name), paramName);
}
return(path);
}
