public static PropResult GetExpressionValue <TSource, TProperty>(this TSource source,
Expression <Func <TSource, TProperty> > exp)
{
Type type = typeof(TSource);
if (exp.Body is MethodCallExpression)
{
var member = exp.Body as MethodCallExpression;
var methodResult = Expression.Lambda(member, exp.Parameters.ToArray()).Compile().DynamicInvoke(source);
var result = new PropResult();
result.Name = member.ToString();
result.Value = methodResult;
result.ObjectType = source.GetType();
return(result);
}
if (exp.Body is UnaryExpression)
{
var member = exp.Body as UnaryExpression;
var methodResult = Expression.Lambda(member, exp.Parameters.ToArray()).Compile().DynamicInvoke(source);
var result = new PropResult();
result.Name = member.ToString();
result.Value = methodResult;
result.ObjectType = source.GetType();
return(result);
}
if (exp.Body is MemberExpression)
{
var member = exp.Body as MemberExpression;
var propInfo = member.Member as PropertyInfo;
var result = new PropResult();
result.Name = propInfo.Name;
result.Value = propInfo.GetValue(source, null);
result.ObjectType = source.GetType();
return(result);
}
throw new NotImplementedException("GetExpressionValue");
}
public static PropResult GetExpressionValue <TSource, TProperty>(this TSource source,
Expression <Func <TSource, TProperty> > exp)
{
Type type = typeof(TSource);
if (exp.Body is MethodCallExpression)
{
var member = exp.Body as MethodCallExpression;
if (!_cache4GetExpressionValueAsMethodCallExpression.ContainsKey(exp))
{
var compiledLambda = Expression.Lambda(member, exp.Parameters.ToArray()).Compile();
_cache4GetExpressionValueAsMethodCallExpression.Add(exp, compiledLambda);
}
//var methodResult = compiledLambda.DynamicInvoke(source);
var methodResult = _cache4GetExpressionValueAsMethodCallExpression[exp].DynamicInvoke(source);
var result = new PropResult();
result.Name = member.ToString();
result.Value = methodResult;
result.ObjectType = source.GetType();
return(result);
}
if (exp.Body is UnaryExpression)
{
var member = exp.Body as UnaryExpression;
if (!_cache4GetExpressionValueAsUnaryExpression.ContainsKey(exp))
{
var compiledLambda = Expression.Lambda(member, exp.Parameters.ToArray()).Compile();
_cache4GetExpressionValueAsUnaryExpression.Add(exp, compiledLambda);
}
//var methodResult = compiledLambda.DynamicInvoke(source);
var methodResult = _cache4GetExpressionValueAsUnaryExpression[exp].DynamicInvoke(source);
var result = new PropResult();
result.Name = member.ToString();
result.Value = methodResult;
result.ObjectType = source.GetType();
return(result);
}
if (exp.Body is MemberExpression)
{
var member = exp.Body as MemberExpression;
var propInfo = member.Member as PropertyInfo;
var result = new PropResult();
result.Name = propInfo.Name;
if (!_cache4FastGetters.ContainsKey(type))
{
_cache4FastGetters.Add(type, new Dictionary <PropertyInfo, Delegate>());
}
var _cache4FastGettersFunctions = _cache4FastGetters[type];
if (!_cache4FastGettersFunctions.ContainsKey(propInfo))
{
var fastGetter = BuildUntypedGetter <TSource>(propInfo);
_cache4FastGettersFunctions.Add(propInfo, fastGetter);
}
else
{
}
var value = _cache4FastGettersFunctions[propInfo].DynamicInvoke(source);
//result.Value = propInfo.GetValue(source, null);
result.Value = value;
result.ObjectType = source.GetType();
return(result);
}
throw new NotImplementedException("GetExpressionValue");
}
