C#控制数据的对齐

struct MyStruct
{
    int a;
    int b;
    int c;
}

// 使用 AlignOf 方法设置结构体成员的对齐方式
int alignment = 4;
Type type = typeof(MyStruct);
FieldOffsetAttribute offsetAttribute =
    (FieldOffsetAttribute)type.GetCustomAttributes(typeof(FieldOffsetAttribute), false)[0];
int fieldOffset = offsetAttribute.Offset;

// 计算结构体成员的对齐方式
int size = System.Runtime.InteropServices.Marshal.SizeOf(type);
int alignmentMask = size - 1;
int offset = fieldOffset & alignmentMask;
int alignmentShift = fieldOffset & 0x00000001;
int newAlignment = (alignment & 0x00000001) << alignmentShift;

// 使用新对齐方式设置结构体成员的对齐方式
System.Runtime.InteropServices.Marshal.StructureToPtr(instance, structurePtr, false, newAlignment);