如果你的目标是获取一个列表（在这种情况下，是FileNames）并快速确定哪些项目（在这种情况下，字符串）可以根据某些标准排除（在这种情况下，一组中的匹配）字符串），考虑这样的事情：

If your goal is take a list (in this case, of FileNames) and quickly determine which items (in this case, strings) can be excluded based on some criterion (in this case, a match in a set of strings), consider something like this:

using System;
using System.Collections.Generic;
using System.Linq;

IgnoreFolders = new List<string>
{
    "SYNC ISSUES",
    "TRASH",
    "JUNK",
};

TestNames = new List<string>
{
    "SYNC ISSUES1",
    "SYNC ISSUES2",
    "sometrash", "trash more", "my trash is",
    "myJUNK", "junkYOUR", "JUNKJUNKJUNK",
    "good name 1", "june bug good name",
    "tras hot good name", "jun k tras h"
};

var FileNamesToIgnore = TestNames
    .Where(name => IgnoreFolders
        .Any(itm => name.ToUpper()
            .Contains(itm)));

var GoodToGoFileNames = TestNames.Except(FileNamesToIgnore);

您可以轻松地将此代码包装在一个函数中;为了重复使用，我建议在该函数中有一个布尔标志，用于确定是否应忽略letter-case（如示例中所示）。

You could easily wrap this code in a Function; for re-use, I'd suggest having a boolean flag in that function that determined whether letter-case should be ignored (as in the example, here).

bool IgnoreFolder(Folder folder)
{
    String folderName = folder.Name.ToLower();

    return IgnoreFolders.Any(x => folderName.Contains(x.ToLower()));
}

这将是LINQified版本：

This would be the LINQified version:

bool IgnoreFolder(Folder folder)
{
    String FolderName = folder.Name.ToUpper();

    return IgnoreFolders.Any(ign => FolderName.StartsWith(ign.ToUpper());
}