[英]Generic Type Extension Method ToMultidimensionalArray
I'm currently trying to convert an IEnumerable<T>
to a 2-dimensional array of type T2 using an extension method with generic types.我目前正在尝试使用具有泛型类型的扩展方法将
IEnumerable<T>
转换为 T2 类型的二维数组。 You should also be able to choose which properties of T you want to include into that array.您还应该能够选择要包含在该数组中的 T 的哪些属性。
Here's what I got so far:这是我到目前为止得到的:
public static T2[][] ToMultidimensionalArray<T, T2>(this IEnumerable<T> enumerable, int count, params string[] propNames)
{
IEnumerator<T> enumerator = enumerable.GetEnumerator();
T2[][] resultArray = new T2[count][];
int i = 0;
int arrLength = propNames.Length;
while (enumerator.MoveNext())
{
resultArray[i] = new T2[arrLength];
int j = 0;
foreach(string prop in propNames)
{
resultArray[i][j] = ((T)enumerator.Current).//How do I access the properties?
j++;
}
i++;
}
return resultArray;
}
I'm having a problem accessing the properties of enumerator.Current
within the foreach
-Loop.我在访问
foreach
-Loop 中enumerator.Current
的属性时遇到问题。
I'm using .NET-Framework 4.0.我正在使用 .NET-Framework 4.0。
Any input would be greatly appreciated.任何投入将不胜感激。
Thanks,谢谢,
Dennis丹尼斯
In general, this problem can be solved using reflection:一般来说,这个问题可以使用反射来解决:
public static T2[][] ToMultidimensionalArray<T, T2>(
this IEnumerable<T> enumerable,
int count,
params string[] propNames)
{
T2[][] resultArray = new T2[count][];
int i = 0;
int arrLength = propNames.Length;
foreach (var item in enumerable)
{
resultArray[i] = new T2[arrLength];
int j = 0;
foreach (string prop in propNames)
{
// Get the required property info using reflection
var propertyInfo = typeof(T).GetProperty(prop);
// Extract the getter method of the property
var getter = propertyInfo.GetGetMethod();
// Invoke the getter and get the property value
var value = getter.Invoke(item, null);
// Cast the value to T2 and store in the array
resultArray[i][j] = (T2) value;
j++;
}
i++;
}
return resultArray;
}
I understood the problem as having a T
s collection where these objects have properties of T2
type.我将问题理解为有一个
T
s 集合,其中这些对象具有T2
类型的属性。 The goal is to take the properties of each object and place them in a multidimensional array.目标是获取每个 object 的属性并将它们放入多维数组中。 Correct me if I'm wrong.
如我错了请纠正我。
Do you mean (T2)typeof(T).GetProperty(prop).GetValue(enumerator.Current, null);你的意思是 (T2)typeof(T).GetProperty(prop).GetValue(enumerator.Current, null);
But I can't understand what you want.但我无法理解你想要什么。 I don't think this method can work.
我认为这种方法行不通。
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