I'm trying to get the field info of an array value from within a struct. So far I have the following, but I dont see how to get the infomration I want.
[StructLayout(LayoutKind.Sequential)]
public struct Test
{
public byte Byte1;
[MarshalAs(UnmanagedType.ByValArray, SizeConst=3)]
public Test2[] Test1;
}
BindingFlags struct_field_flags = BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Static | BindingFlags.Instance | BindingFlags.DeclaredOnly;
FieldInfo[] all_struct_fields = typeof(Test).GetFields(struct_field_flags);
foreach (FieldInfo struct_field in all_struct_fields)
{
if(struct_field.FieldType.IsArray)
{
// Get FieldInfo for each value in the Test1 array within Test structure
}
}
So if I did:
Type array_type = struct_field.FieldType.GetElementType();
This would return Test2 type, but I dont want the type of the array, I want the FieldInfo or Fields of that structure so I can set values from within it.
Sorry for the initial wrong answer. I was too lazy to create my own Test2 type so I used a string instead. Here's the right answer (hopefully):
I did what you want to do with the following code:
class Program
{
static void Main(string[] args)
{
object sampleObject = GetSampleObject();
FieldInfo[] testStructFields = typeof(Test).GetFields();
foreach (FieldInfo testStructField in testStructFields)
{
if (testStructField.FieldType.IsArray)
{
// We can cast to ILIst because arrays implement it and we verfied that it is an array in the if statement
System.Collections.IList sampleObject_test1 = (System.Collections.IList)testStructField.GetValue(sampleObject);
// We can now get the first element of the array of Test2s:
object sampleObject_test1_Element0 = sampleObject_test1[0];
// I hope this the FieldInfo that you want to get:
FieldInfo myValueFieldInfo = sampleObject_test1_Element0.GetType().GetField("MyValue");
// Now it is possible to read and write values
object sampleObject_test1_Element0_MyValue = myValueFieldInfo.GetValue(sampleObject_test1_Element0);
Console.WriteLine(sampleObject_test1_Element0_MyValue); // prints 99
myValueFieldInfo.SetValue(sampleObject_test1_Element0, 55);
sampleObject_test1_Element0_MyValue = myValueFieldInfo.GetValue(sampleObject_test1_Element0);
Console.WriteLine(sampleObject_test1_Element0_MyValue); // prints 55
}
}
}
static object GetSampleObject()
{
Test sampleTest = new Test();
sampleTest.Test1 = new Test2[5];
sampleTest.Test1[0] = new Test2() { MyValue = 99 };
object sampleObject = sampleTest;
return sampleObject;
}
}
[StructLayout(LayoutKind.Sequential)]
public struct Test2
{
public int MyValue;
}
[StructLayout(LayoutKind.Sequential)]
public struct Test
{
public byte Byte1;
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 3)]
public Test2[] Test1;
}
This is the most important line:
FieldInfo myValueFieldInfo = sampleObject_test1_Element0.GetType().GetField("MyValue");
It should give you the FieldInfo that you are talking about.