自动生成缓存Key值的CacheKeyHelper

/// <summary>
/// CacheKeyHelper
/// </summary>
public class CacheKeyHelper
{
/// <summary>
/// 域名
/// </summary>
const string DomainName = "App";

/// <summary>
/// 当前类型
/// </summary>
private static readonly Type CurrentType = typeof (CacheKeyHelper);

/// <summary>
/// 获取缓存Key
/// </summary>
/// <param name="detailCacheKey">PartialCacheKey</param>
/// <returns></returns>
public static string GetCacheKey(string detailCacheKey)
{
MethodBase mb = GetCaller();
if (mb != null && mb.DeclaringType != null)
{
return string.Format("{0}:{1}:{2}:{3}_{4}", DomainName, mb.DeclaringType.Namespace, mb.DeclaringType.Name, mb.Name, detailCacheKey.Md5());
}

return string.Format("{0}_{1}", DomainName, detailCacheKey.Md5());
}

/// <summary>
/// 获取缓存Key
/// </summary>
/// <param name="reqObj">reqObj</param>
/// <param name="properties">properties</param>
/// <returns>PartialCacheKey</returns>
public static string GetCacheKey<T>(T reqObj, IEnumerable<string> properties) where T : class
{
return GetCacheKey(string.Join("_", properties.Select(p => reqObj.GetPropertyValue(p, "null").ToString())));
}

/// <summary>
/// 获取缓存Key
/// </summary>
/// <param name="reqObj">reqObj</param>
/// <returns>PartialCacheKey</returns>
public static string GetCacheKey<T>(T reqObj) where T : class
{
return GetCacheKey(reqObj, typeof(T).GetProperties().Where(p => p.CanRead).Select(q => q.Name));
}

/// <summary>
/// 获得非本类的直接调用者
/// </summary>
/// <returns></returns>
private static MethodBase GetCaller()
{
var ss = new StackTrace(false);
var currentClass = ss.GetFrame(0).GetMethod().DeclaringType;
MethodBase mb = null;
var level = 1;
while (true)
{
//index:0为本身的方法；1为调用方法；2为其上上层，依次类推
mb = ss.GetFrame(level).GetMethod();
if (mb.DeclaringType == null)
{
break;
}

if (mb.DeclaringType != CurrentType)
{
break;
}

level++;
}

return mb;
}
}