/// <summary>找到所引用的参考字段</summary>
/// <param name="target"></param>
/// <param name="member"></param>
/// <param name="value"></param>
/// <returns></returns>
MemberInfoX FindReference(Object target, MemberInfo member, out Object value)
{
value = null;
if (member == null)
{
return(null);
}
if (String.IsNullOrEmpty(ReferenceName))
{
return(null);
}
// 考虑ReferenceName可能是圆点分隔的多重结构
MemberInfoX mx = null;
Type type = member.DeclaringType;
value = target;
var ss = ReferenceName.Split(".");
for (int i = 0; i < ss.Length; i++)
{
mx = MemberInfoX.Create(type, ss[i]);
if (mx == null)
{
return(null);
}
// 最后一个不需要计算
if (i < ss.Length - 1)
{
type = mx.Type;
value = mx.GetValue(value);
}
}
//var mx = MemberInfoX.Create(member.DeclaringType, ReferenceName);
//if (mx == null) return null;
// 目标字段必须是整型
TypeCode tc = Type.GetTypeCode(mx.Type);
if (tc >= TypeCode.SByte && tc <= TypeCode.UInt64)
{
return(mx);
}
return(null);
}
/// <summary>设置目标对象的引用大小值</summary>
/// <param name="target"></param>
/// <param name="member"></param>
/// <param name="encoding"></param>
internal void SetReferenceSize(Object target, MemberInfo member, Encoding encoding)
{
Object v = null;
var mx = FindReference(target, member, out v);
if (mx == null)
{
return;
}
// 获取当前成员（加了特性）的值
var value = MemberInfoX.Create(member).GetValue(target);
if (value == null)
{
return;
}
// 尝试计算大小
Int32 size = 0;
if (value is String)
{
if (encoding == null)
{
encoding = Encoding.UTF8;
}
size = encoding.GetByteCount("" + value);
}
else if (value.GetType().IsArray)
{
size = (value as Array).Length;
}
else if (value is IEnumerable)
{
foreach (var item in value as IEnumerable)
{
size++;
}
}
// 给参考字段赋值
mx.SetValue(v, size - Size);
}