难道不允许在一个lambda EX pression中的ForEach有条件的经营者？

Is it not allowed to have a conditional operator in a lambda expression in ForEach?

List<string> items = new List<string>{"Item 1", "Item 2", "Item I Care About"};

string whatICareAbout = "";

// doesn't compile :(
items.ForEach(item => item.Contains("I Care About") ? 
whatICareAbout += item + "," : whatICareAbout += "");

编译错误 - >只有分配，调用，递增，递减和新对象前pressions可作为一项声明

Compilation error -> "Only assignment, call, increment, decrement, and new object expressions can be used as a statement"

试图用一个正常的，如果不工作或者：

Trying to use a normal if doesn't work either:

// :(
items.ForEach(item => if (item.Contains("I Care About")) {whatICareAbout += item + ", ";}

不可能的？

推荐答案

您正在使用较短的形式的拉姆达EX pressions，只允许一个EX pressions。 你需要从长远的形式，它允许多个语句。

You're using the shorter form of lambda expressions, which only allow a single expressions. You need to the long form, which allows multiple statements.

例如：

items.ForEach(item => {
    if (item.Contains("I Care About")) 
        whatICareAbout += item + ", ";
});