java - 使用 java 将增强 for 循环转换为 c# 时出错

Question

我尝试在我的 C# 代码中增强 Java 代码的 for 循环:

for (float value : array) {
    if (Float.isInfinite(value) || Float.isNaN(value)) {
        value = 0;
    }
}

我尝试过这个:

foreach (float value in array)
{
    if (float.IsInfinity(value) || float.IsNaN(value))
    {
        value = 0;
    }
}

但是我有这个错误，告诉我我无权修改值，因为它是迭代变量。

Answer 1

如果要更新迭代器变量，则需要使用普通的 for 循环:

for(int i = 0 ; i < array.Length; i++)
{

    if (float.IsInfinity(array[i]) || float.IsNaN(array[i]))
    {
        array[i] = 0;
    }
}

来自 C# 规范:

The iteration variable corresponds to a read-only local variable with a scope that extends over the embedded statement. During execution of a foreach statement, the iteration variable represents the collection element for which an iteration is currently being performed. A compile-time error occurs if the embedded statement attempts to modify the iteration variable (via assignment or the ++ and -- operators) or pass the iteration variable as a ref or out parameter.