c# - =+ 是什么意思，为什么要编译？

Question

我有以下错字:

subcomponentGroupCount = +subcomponentCount;

用于以下方面:

int subcomponentGroupCount = 0;

foreach (Subcomponent subcomponent in group.Subcomponents)
{
    int subcomponentCount = task.TaskDevice.TaskDeviceSubcomponents.Count(tds => tds.TemplateID == subcomponent.TemplateID);
    subcomponentGroupCount = +subcomponentCount;
}

我打算将它设为 +=，但我想知道“= +var”是什么意思......

Answer 1

+ 运算符可以用作二元或一元运算符。来自 MSDN :

Unary + operators are predefined for all numeric types. The result of a unary + operation on a numeric type is just the value of the operand.

您可以为自定义类型重载此运算符，但对于内置数字类型，这本质上是空操作。