C# 无法从IEnumerable转换为IEnumerable
最近,我一直在从事前端编程,但我正在为一个项目重新投入C语言。我正在定义一些模型和通用功能,并出现以下错误: 错误3参数2:无法从“System.Collections.Generic.IEnumerable[c:\Program Files x86\Reference Assembly\Microsoft\Framework.NETFramework\v4.5\mscorlib.dll]”转换为“System.Collections.Generic.IEnumerable[c:\Program Files x86\Reference Assembly\Microsoft\Framework.NETFramework\v4.5\mscorlib.dll]” 错误来自以下函数中的return语句:C# 无法从IEnumerable转换为IEnumerable,c#,linq,generics,ienumerable,mscorlib,C#,Linq,Generics,Ienumerable,Mscorlib,最近,我一直在从事前端编程,但我正在为一个项目重新投入C语言。我正在定义一些模型和通用功能,并出现以下错误: 错误3参数2:无法从“System.Collections.Generic.IEnumerable[c:\Program Files x86\Reference Assembly\Microsoft\Framework.NETFramework\v4.5\mscorlib.dll]”转换为“System.Collections.Generic.IEnumerable[c:\Program
public static PagedResult<T> Create<T, TEntity>(IOrderedQueryable<TEntity> query, PagedRequest pagedRequest, Func<TEntity, T> converter)
where T : class
{
var count = query.Count();
if (pagedRequest.SortInfo.Fields.Any())
{
var firstPass = true;
foreach (var sortOrder in pagedRequest.SortInfo.Fields)
{
if (firstPass)
{
firstPass = false;
query = sortOrder.Direction == SortDirection.Ascending
? query.OrderBy(sortOrder.Field) :
query.OrderByDescending(sortOrder.Field);
}
else
{
query = sortOrder.Direction == SortDirection.Ascending
? query.ThenBy(sortOrder.Field) :
query.ThenByDescending(sortOrder.Field);
}
}
}
query = (IOrderedQueryable<TEntity>) query.Skip((pagedRequest.Page - 1) * pagedRequest.PageSize).Take(pagedRequest.PageSize);
var list = new List<T>();
foreach (var entity in query)
{
list.Add(converter(entity));
}
return Create(pagedRequest, list.AsEnumerable(), count);
}
static public PagedResult<T> Create(PagedRequest request, IEnumerable<T> data, long totalCount)
{
var result = new PagedResult<T> {Status = ResultStatus.Successful, Data = data.ToArray()};
result.Count = result.Data.Count();
result.TotalCount = totalCount;
result.Page.Index = request.Page;
result.Page.Size = request.PageSize;
if (result.Page.Size > 0)
{ result.Page.Count = (long)Math.Ceiling((double)totalCount / result.Page.Size); }
return result;
}
以及创建功能:
public static PagedResult<T> Create<T, TEntity>(IOrderedQueryable<TEntity> query, PagedRequest pagedRequest, Func<TEntity, T> converter)
where T : class
{
var count = query.Count();
if (pagedRequest.SortInfo.Fields.Any())
{
var firstPass = true;
foreach (var sortOrder in pagedRequest.SortInfo.Fields)
{
if (firstPass)
{
firstPass = false;
query = sortOrder.Direction == SortDirection.Ascending
? query.OrderBy(sortOrder.Field) :
query.OrderByDescending(sortOrder.Field);
}
else
{
query = sortOrder.Direction == SortDirection.Ascending
? query.ThenBy(sortOrder.Field) :
query.ThenByDescending(sortOrder.Field);
}
}
}
query = (IOrderedQueryable<TEntity>) query.Skip((pagedRequest.Page - 1) * pagedRequest.PageSize).Take(pagedRequest.PageSize);
var list = new List<T>();
foreach (var entity in query)
{
list.Add(converter(entity));
}
return Create(pagedRequest, list.AsEnumerable(), count);
}
static public PagedResult<T> Create(PagedRequest request, IEnumerable<T> data, long totalCount)
{
var result = new PagedResult<T> {Status = ResultStatus.Successful, Data = data.ToArray()};
result.Count = result.Data.Count();
result.TotalCount = totalCount;
result.Page.Index = request.Page;
result.Page.Size = request.PageSize;
if (result.Page.Size > 0)
{ result.Page.Count = (long)Math.Ceiling((double)totalCount / result.Page.Size); }
return result;
}
似乎无法消除编译时错误。有人知道如何解决这个问题吗?多亏了@JeffMercado,解决方案非常简单 我的第二个Create函数的方法签名需要是:
static public PagedResult<T> Create<T>(PagedRequest request, IEnumerable<T> data, long totalCount)
而不是:
static public PagedResult<T> Create(PagedRequest request, IEnumerable<T> data, long totalCount)
您的Create函数应该是泛型的。那不是从哪里来的?它与其他Create函数不同。谢谢@JeffMercado。就是这样。请输入此解决方案作为答案,以便我们和其他人可以更轻松地从您的问题中学习?