/// <summary>
/// 并行排序，并返回排序后的List列表
/// 自定义列与升倒序键值对
/// </summary>
/// <param name="list"></param>
/// <param name="sort">Key:名称，值:true:升序，false:倒序</param>
public static void Sort <T>(this List <T> list, Dictionary <string, bool> sort)
{
if (sort == null || sort.Count == 0)
{
throw new ArgumentException("Sorting is not set.");
}
if (list.Count == 0)
{
return;
}
var item = sort.ElementAt(0);
var type = list[0].GetType();
var builder = SortBuilder.CreateBuilder(type, item.Key, out bool iString);
var property = type.Property(item.Key);
OrderedParallelQuery <T> orderBy;
if (iString)
{
orderBy = item.Value ? list.AsParallel().OrderBy(c => builder.Build(c) as string, new StringComparer()) :
list.AsParallel().OrderByDescending(c => builder.Build(c) as string, new StringComparer());
}
else
{
orderBy = item.Value ? list.AsParallel().OrderBy(c => builder.Build(c)) : list.AsParallel().OrderByDescending(c => builder.Build(c));
}
for (int i = 1; i < sort.Count; i++)
{
item = sort.ElementAt(i);
var builder2 = SortBuilder.CreateBuilder(type, item.Key, out iString);
property = type.Property(item.Key);
if (iString)
{
orderBy = item.Value ? orderBy.ThenBy(c => builder2.Build(c) as string, new StringComparer()) :
orderBy.ThenByDescending(c => builder2.Build(c) as string, new StringComparer());
}
else
{
orderBy = item.Value ? orderBy.ThenBy(c => builder2.Build(c)) : orderBy.ThenByDescending(c => builder2.Build(c));
}
}
var temp = orderBy.ToList();
list.Clear();
list.AddRange(temp);
}
/// <summary>
/// 生成动态代码，创建委托
/// </summary>
public static SortBuilder CreateBuilder(Type type, string name, out bool iString)
{
iString = false;
var property = type.Property(name);
if (property == null)
{
throw new ArgumentException(name + " Argument can not be empty.");
}
if (!property.CanRead)
{
throw new ArgumentException("Cannot read value.");
}
var getTCompareInt = typeof(BuilderHelper).GetMethod(nameof(BuilderHelper.TCompareInt),
TConfig.Flags, null, new Type[] { typeof(object) }, null);
var getTCompareLong = typeof(BuilderHelper).GetMethod(nameof(BuilderHelper.TCompareLong),
TConfig.Flags, null, new Type[] { typeof(object) }, null);
var getTCompareDouble = typeof(BuilderHelper).GetMethod(nameof(BuilderHelper.TCompareDouble),
TConfig.Flags, null, new Type[] { typeof(object) }, null);
var dbType = property.PropertyType;
if (dbType.IsGenericType && Nullable.GetUnderlyingType(dbType) != null)
{
dbType = Nullable.GetUnderlyingType(dbType);
}
if (dbType.IsEnum)
{
dbType = dbType.GetEnumUnderlyingType();
}
var dymMethod = new DynamicMethod(type.Name + nameof(SortBuilder), typeof(string), new Type[] { typeof(object) }, true);
switch (dbType.Name)
{
case nameof(Int32):
case nameof(Int16):
case nameof(Byte):
case nameof(Boolean):
case nameof(Image):
case nameof(Bitmap):
dymMethod = new DynamicMethod(type.Name + nameof(SortBuilder), typeof(int), new Type[] { typeof(object) }, true);
break;
case nameof(Int64):
case nameof(DateTime):
dymMethod = new DynamicMethod(type.Name + nameof(SortBuilder), typeof(long), new Type[] { typeof(object) }, true);
break;
case nameof(Double):
case nameof(Single):
case nameof(Decimal):
dymMethod = new DynamicMethod(type.Name + nameof(SortBuilder), typeof(double), new Type[] { typeof(object) }, true);
break;
}
var generator = dymMethod.GetILGenerator(); // Create ILGenerator
generator.GetValue(property, type); //获取引用值
switch (dbType.Name)
{
case nameof(Int32):
case nameof(Int16):
case nameof(Byte):
case nameof(Boolean):
case nameof(Image):
case nameof(Bitmap):
generator.Emit(OpCodes.Call, getTCompareInt); //调用静态方法
break;
case nameof(Int64):
case nameof(DateTime):
generator.Emit(OpCodes.Call, getTCompareLong); //调用静态方法
break;
case nameof(Double):
case nameof(Single):
case nameof(Decimal):
generator.Emit(OpCodes.Call, getTCompareDouble); //调用静态方法
break;
default:
//String不用再次转化
//generator.Emit(OpCodes.Call, getTCompareString);//调用静态方法
break;
}
generator.Emit(OpCodes.Ret);
var builder = new SortBuilder();
switch (dbType.Name)
{
case nameof(Int32):
case nameof(Int16):
case nameof(Byte):
case nameof(Boolean):
case nameof(Image):
case nameof(Bitmap):
builder.handler = dymMethod.CreateDelegate(typeof(Func <object, int>));
break;
case nameof(Int64):
case nameof(DateTime):
builder.handler = dymMethod.CreateDelegate(typeof(Func <object, long>));
break;
case nameof(Double):
case nameof(Single):
case nameof(Decimal):
builder.handler = dymMethod.CreateDelegate(typeof(Func <object, double>));
break;
default:
iString = true;
builder.handler = dymMethod.CreateDelegate(typeof(Func <object, string>));
break;
}
return(builder);
}
