这是创建日志的实用程序类。
internal class ParamaterLogModifiedUtility
{
private String _methodName;
private String _paramaterLog;
private readonly JavaScriptSerializer _serializer;
private readonly Dictionary<String, Type> _methodParamaters;
private readonly List<Tuple<String, Type, object>>_providedParametars;
public ParamaterLogModifiedUtility(params Expression<Func<object>>[] providedParameters)
{
try
{
_serializer = new JavaScriptSerializer();
var currentMethod = new StackTrace().GetFrame(1).GetMethod();
/*Set class and current method info*/
_methodName = String.Format("Class = {0}, Method = {1}", currentMethod.DeclaringType.FullName, currentMethod.Name);
/*Get current methods paramaters*/
_methodParamaters = new Dictionary<string, Type>();
(from aParamater in currentMethod.GetParameters()
select new { Name = aParamater.Name, DataType = aParamater.ParameterType })
.ToList()
.ForEach(obj => _methodParamaters.Add(obj.Name, obj.DataType));
/*Get provided methods paramaters*/
_providedParametars = new List<Tuple<string, Type, object>>();
foreach (var aExpression in providedParameters)
{
Expression bodyType = aExpression.Body;
if (bodyType is MemberExpression)
{
AddProvidedParamaterDetail((MemberExpression)aExpression.Body);
}
else if (bodyType is UnaryExpression)
{
UnaryExpression unaryExpression = (UnaryExpression)aExpression.Body;
AddProvidedParamaterDetail((MemberExpression)unaryExpression.Operand);
}
else
{
throw new Exception("Expression type unknown.");
}
}
/*Process log for all method parameters*/
ProcessLog();
}
catch (Exception exception)
{
throw new Exception("Error in paramater log processing.", exception);
}
}
private void ProcessLog()
{
try
{
foreach (var aMethodParamater in _methodParamaters)
{
var aParameter =
_providedParametars.Where(
obj => obj.Item1.Equals(aMethodParamater.Key) && obj.Item2 == aMethodParamater.Value).Single();
_paramaterLog += String.Format(@" ""{0}"":{1},", aParameter.Item1, _serializer.Serialize(aParameter.Item3));
}
_paramaterLog = (_paramaterLog != null) ? _paramaterLog.Trim(' ', ',') : string.Empty;
}
catch (Exception exception)
{
throw new Exception("MathodParamater is not found in providedParameters.");
}
}
private void AddProvidedParamaterDetail(MemberExpression memberExpression)
{
ConstantExpression constantExpression = (ConstantExpression) memberExpression.Expression;
var name = memberExpression.Member.Name;
var value = ((FieldInfo) memberExpression.Member).GetValue(constantExpression.Value);
var type = value.GetType();
_providedParametars.Add(new Tuple<string, Type, object>(name, type, value));
}
public String GetLog()
{
return String.Format("{0}({1})", _methodName, _paramaterLog);
}
}
使用实用程序
class PersonLogic
{
public bool Add(PersonEntity aPersonEntity, ushort age = 12, String id = "1", String name = "Roy")
{
string log = new ParamaterLogModifiedUtility(() => aPersonEntity, () => age, () => id, () => name).GetLog();
return true;
}
}
现在调用用法
class Program
{
static void Main(string[] args)
{
try
{
PersonLogic personLogic = new PersonLogic();
personLogic.Add(id: "1", age: 24, name: "Dipon", aPersonEntity: new PersonEntity() { Id = "1", Name = "Dipon", Age = 24 });
}
catch (Exception exception)
{
Console.WriteLine("Error.");
}
Console.ReadKey();
}
}
结果日志：
Class = MethodParamatersLog.Logic.PersonLogic, Method = Add("aPersonEntity":{"CreatedDateTime":"\/Date(1383422468353)\/","Id":"1","Name":"Dipon","Age":24}, "age":24, "id":"1", "name":"Dipon")