本文是小编为大家收集整理的关于使用LINQ获取流程[]或从Process []获取流程ID的处理/解决方法，可以参考本文帮助大家快速定位并解决问题，中文翻译不准确的可切换到English标签页查看源文。
问题描述
我已经打开了五个notepad.exe.现在，我想知道与每个notepad.exe关联的所有过程ID.
我知道我可以通过:
检索记事本流程列表process [] processes = process.getProcessesbyname(" Notepad");
，但是现在我想要使用LINQ的那些记事本实例的流程ID的字符串[].我怎么做?我知道我可以创建字符串[]并使用foreach循环填充字符串[]，但是我想知道使用linq.
推荐答案
您可以使用:
Process[] processes = Process.GetProcessesByName("notepad");
string[] ids = processes.Select(p => p.Id.ToString()).ToArray();
但是，我质疑将其放入string[]类型中的需求.最好只离开 process.id 作为整数的值:
Process[] processes = Process.GetProcessesByName("notepad");
var ids = processes.Select(p => p.Id);
foreach(int processId in ids)
{
// Do something with each processId
}
其他推荐答案
您可以写
var ids = Array.ConvertAll(Process.GetProcessesByName("notepad"), p => p.Id);
这将比Select和ToArray快(稍微)，因为它不需要调整数组大小.
如果您可以使用IEnumerable<int>而不是数组，则Select(无ToArray)会更快.
其他推荐答案
您可以使用数组转换而不是Linq:
进行单线线int[] processIds = Array.ConvertAll(Process.GetProcessesByName("notepad"),
p => p.Id);
获取流程ID列表:
Process[] processes = Process.GetProcessesByName("notepad");
var processIdList = processes.Select(p => p.Id).ToList();
获得数组而不是列表，您可以做:
var processIdList = processes.Select(p => p.Id).ToArray();
请注意，该过程ID是类型int.如果您想要一个字符串列表，则可以这样做:
var processIdList = processes.Select(p => p.Id.ToString()).ToArray();
问题描述
I have opened five notepad.exe's. Now I want to know all the process id's associated with each notepad.exe.
I know I can retrieve list of notepad processes by:
Process[] processes = Process.GetProcessesByName("notepad");
But now I want string[] of process Id's of those notepad instances using LINQ. How do I do that? I know i can create string[] and using foreach loop populate the string[] but I would like to know using LINQ.
推荐答案
You can use:
Process[] processes = Process.GetProcessesByName("notepad");
string[] ids = processes.Select(p => p.Id.ToString()).ToArray();
However, I question the need to put this into a string[] type. It might be better to just leave the Process.Id values as integers:
Process[] processes = Process.GetProcessesByName("notepad");
var ids = processes.Select(p => p.Id);
foreach(int processId in ids)
{
// Do something with each processId
}
其他推荐答案
You can write
var ids = Array.ConvertAll(Process.GetProcessesByName("notepad"), p => p.Id);
This will be (slightly) faster than Select and ToArray, since it won't need to resize the array.
If you can use an IEnumerable<int> instead of an array, Select (without ToArray) will be faster.
其他推荐答案
You could do a one-liner using array conversion instead of LINQ:
int[] processIds = Array.ConvertAll(Process.GetProcessesByName("notepad"),
p => p.Id);
To get a list of process ids:
Process[] processes = Process.GetProcessesByName("notepad");
var processIdList = processes.Select(p => p.Id).ToList();
To get an array instead of a list you can do:
var processIdList = processes.Select(p => p.Id).ToArray();
Note that the process Id is of type int. If you wanted a list of strings instead you could just do this:
var processIdList = processes.Select(p => p.Id.ToString()).ToArray();
更多相关问答
联系站长