如何在lambda表达式或linq中编写以下代码？

Question

I just want to know that how to write following code in lambda expression or linq. Please answer if you know.

Process[] runingProcess = Process.GetProcesses();
ManagementObjectCollection moReturn;
ManagementObjectSearcher moSearch;

void func()
{                                                                          
    moSearch = new ManagementObjectSearcher("Select * from Win32_Product");  
    moReturn = moSearch.Get();
    foreach (ManagementObject mo in moReturn)
    {
        foreach (var process in Process.GetProcessesByName(mo["Name"].ToString()))
        {
            process.Kill();
        }
    }
}

Answer 1

Unlike the other answers, I consider using .ToList() and .ForEach(...) to be the opposite of LINQ. Once you use those keywords, your LINQ query ends. Especially .ForEach() , since the purpose of .ForEach(...) is to cause a side-effect , and LINQ is for querying.

My version would be:

// Query for processes to kill
var data = new ManagementObjectSearcher("Select * from Win32_Product")
    .Get()
    .Cast<ManagementObject>()
    .SelectMany(mo => Process.GetProcessesByName(mo["Name"].ToString()));

// Kill the processes
foreach (var item in data) {
    item.Kill();
}

Answer 2

This is LINQ equivalent for iterating part:

moReturn.Cast<ManagementBaseObject>().ToList().ForEach(mo => Process.GetProcessesByName(mo["Name"].ToString()).ToList().ForEach(proc => proc.Kill()));

Edit : This answer is semantically equivalent to the iteration in the OP question, but it doesn't gain anything. See other upvoted answers which is more proper by using SelectMany to flatten the Processes instead of ForEach .

Answer 3

Use SelectMany to flatten processes.

    var moSearch = new ManagementObjectSearcher("Select * from Win32_Product");  
    var moReturn = moSearch.Get();
    var processes = moReturn.Cast<ManagementObject>()
                            .SelectMany (mo => Process.GetProcessesByName(mo["Name"].ToString()))
                            .ToList();

        processes.ForEach(p=> p.Kill() );

or in Query syntax

    var moSearch = new ManagementObjectSearcher("Select * from Win32_Product");  
    var moReturn = moSearch.Get();
    var processes = (from mo in moReturn.Cast<ManagementObject>()
                     from prc in Process.GetProcessesByName(mo["Name"].ToString())
                     select prc).ToList();

        processes.ForEach(p=> p.Kill() );