Resharper总是要求我将foreach循环更改为
linq,我尝试着.这个难倒我.
foreach(var fileEnvironment in fileEnvironmentSection.FileEnvironmentList) {
var element = fileEnvironment as FileEnvironmentElement;
if(element == null) {
//Not the expected type,so nothing to do
} else {
//Have the expected type,so add it to the dictionary
result.Add(element.Key,element.Value);
}
}
fileEnvironment作为配置部分中的对象返回.这就是演员阵容的原因.
解决方法
您可以使用
OfType运算符：
Filters the elements of an IEnumerable based on a specified type.
foreach(var element in fileEnvironmentSection.FileEnvironmentList
.OfType<FileEnvironmentElement>())
{
result.Add(element.Key,element.Value);
}
LINQ不会帮助循环体,因为它改变了现有的字典 – LINQ通常用于创建新数据而不是修改现有数据.
如果你不介意在这里返回一个新词典,你可以这样做：
var newResult = fileEnvironmentSection.FileEnvironmentList
.OfType<FileEnvironmentElement>()
.ToDictionary(element => element.Key,element => element.Value);
