我正在尝试对一个通用集合中的值求和,我在我的代码的其他部分中使用了完全相同的代码来执行此功能,但它似乎与ulong
数据类型?
代码
Items.Sum(e => e.Value);
出现以下错误:
Error 15 The call is ambiguous between the following methods or properties: '
System.Linq.Enumerable.Sum<System.Collections.Generic.KeyValuePair<int,ulong>>(System.Collections.Generic.IEnumerable<System.Collections.Generic.KeyValuePair<int,ulong>>, System.Func<System.Collections.Generic.KeyValuePair<int,ulong>,float>)
' and 'System.Linq.Enumerable.Sum<System.Collections.Generic.KeyValuePair<int,ulong>>(System.Collections.Generic.IEnumerable<System.Collections.Generic.KeyValuePair<int,ulong>>, System.Func<System.Collections.Generic.KeyValuePair<int,ulong>,decimal?>
)
public class Teststuff : BaseContainer<int, ulong, ulong>
{
public decimal CurrentTotal { get { return Items.Sum(e => e.Value); } }
public override void Add(ulong item, int amount = 1)
{
}
public override void Remove(ulong item, int amount = 1)
{
}
}
public abstract class BaseContainer<T, K, P>
{
/// <summary>
/// Pass in the owner of this container.
/// </summary>
public BaseContainer()
{
Items = new Dictionary<T, K>();
}
public BaseContainer()
{
Items = new Dictionary<T, K>();
}
public Dictionary<T, K> Items { get; private set; }
public abstract void Add(P item, int amount = 1);
public abstract void Remove(P item, int amount = 1);
}
最佳答案
Sum()
没有返回 ulong
的重载,编译器无法决定要调用哪些重载。
您可以通过强制转换帮助它做出决定:
Items.Sum(e => (decimal)e.Value)
关于c# - 在 LINQ 中使用求和方法,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/21028785/