[英]How to create generic T class?
我在ASP.NET MVC中有两个功能。 如何将这些函数转换为通用类(class)?
public JsonResult CreateProduct(List<Product> Products, List<GroupExpression> GroupExpression)
{
List<GroupExpression> InvalidGroupExpression = ValidateColumnInList(Products, GroupExpression);
if (InvalidGroupExpression.Count() <= 0)
{
string[] Fields = GroupExpression.Select(x => x.ExpressionName).ToArray();
var LambdaExp = GroupExpressionBuilder.GroupByExpression<Product>(Fields);
IEnumerable<Product> DuplicateProducts = Products.GroupBy(LambdaExp.Compile()).Where(g => g.Skip(1).Any()).SelectMany(g => g).ToList();
IEnumerable<object> Indices = DuplicateProducts.Select<Product, object>(x => Products.IndexOf(x)).ToList();
return Json(new { Success = true, Indices }, JsonRequestBehavior.AllowGet);
}
else
{
//return Json(new { Message = false });
return Json(new { Success = false, InvalidGroupExpression }, JsonRequestBehavior.AllowGet);
}
}
public List<GroupExpression> ValidateColumnInList(List<Product> Products, List<GroupExpression> GroupExpression)
{
//bool IsValid = true;
List<GroupExpression> TempGroupExpression = new List<GroupExpression>();
foreach (var GrpExpression in GroupExpression)
{
bool IsContainColumn = typeof(Product).GetProperties().Any(column => column.Name == GrpExpression.ExpressionName);
if (!IsContainColumn)
{
TempGroupExpression.Add(GrpExpression);
//IsValid = false;
}
}
//GroupExpression.RemoveAll(x => TempGroupExpression.Contains(x));
//return IsValid;
return TempGroupExpression;
}
在以上功能中。 我想将列表产品,列表GroupExpression转换为参数。 我是T课的新手。 我该怎么做呢?
这些功能的签名如下。
public JsonResult CreateProduct<T>(List<T> Products,
List<GroupExpression> GroupExpression)
{
}
public List<T> ValidateColumnInList<T>(List<T> Products,
List<GroupExpression> GroupExpression)
{
}
对于您的特定情况,您将查找以下内容:
class SomeClass
{
public void SomeMethod()
{
var groupExpressions = new List<GroupExpression>();
// populate GroupExpressions somehow
var validatedGroups = ValidateColumnInList<Product, GroupExpression>(groupExpressions);
}
public List<TGroup> ValidateColumnInList<TItem, TGroup>(List<TGroup> GroupExpression) where TGroup: GroupExpression
{
List<TGroup> TempGroupExpression = new List<TGroup>();
var itemProperties = typeof(TItem).GetProperties();
foreach (var GrpExpression in GroupExpression)
{
bool IsContainColumn = itemProperties.Any(column => column.Name == GrpExpression.ExpressionName);
if (!IsContainColumn)
{
TempGroupExpression.Add(GrpExpression);
}
}
return TempGroupExpression;
}
public JsonResult CreateProduct<TItem, TGroup>(List<TItem> Products, List<TGroup> GroupExpression) where TGroup : GroupExpression
{
List<TGroup> InvalidGroupExpression = ValidateColumnInList<TItem, TGroup>(GroupExpression);
if (InvalidGroupExpression.Count() <= 0)
{
string[] Fields = GroupExpression.Select(x => x.ExpressionName).ToArray();
var LambdaExp = GroupExpressionBuilder.GroupByExpression<TItem>(Fields);
IEnumerable<TItem> DuplicateProducts = Products.GroupBy(LambdaExp.Compile()).Where(g => g.Skip(1).Any()).SelectMany(g => g).ToList();
IEnumerable<object> Indices = DuplicateProducts.Select<TItem, object>(x => Products.IndexOf(x)).ToList();
return Json(new { Success = true, Indices }, JsonRequestBehavior.AllowGet);
}
else
{
//return Json(new { Message = false });
return Json(new { Success = false, InvalidGroupExpression }, JsonRequestBehavior.AllowGet);
}
}
}
internal class Product
{
}
internal class GroupExpression
{
public string ExpressionName;
}
我从方法参数中删除了List<TItem> items
,因为您只使用它的类型来迭代属性,并使用它来匹配是否应进行验证。
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