C# .NET字符串包含字符串[]

我有一个小问题，把这句话放在一起，任何帮助都会很棒

string betaFilePath = @"C:\resultsalpha.txt";
StringBuilder sb = new StringBuilder();
using (FileStream fs = new FileStream(betaFilePath, FileMode.Open))
using (StreamReader rdr = new StreamReader((fs)))
{
    while (!rdr.EndOfStream)
    {
        string betaFileLine = rdr.ReadLine();
        {
            string[] onlythese = {@"apple/",@"aee/",@"www/",@"blk/",@"art/",@"purp/",@"ora/",@"red/",@"brd/",@"biek/",@"biz/"};
            if (betaFileLine.Contains(onlythese))
            {
                File.AppendAllText(@"C:\testtestest.txt", betaFileLine);

            }
        }
    }

---

错误：参数“1”：无法从“string[]”转换为“string”->if（betaFileLine.Contains（onlythes））

您无法将数组传递到

字符串。Contains

-您需要在字符串[]中循环并检查每个字符串，或者使用LINQ:

if(onlythese.Any(a => betaFileLine.Contains(a)))

试一试

您需要“使用System.Linq；”

快去营救

if(onlythese.Any(str => betaFileLine.Contains(str)))
{
    // ...
}

---

只需检查其中的每一项：

bool isOK = false;

foreach (string current in onlythese)
  if (betaFileLine.Contains(current))
  {
     isOK = true;
     break;
  }

if (isOK)
{
   File.AppendAllText(@"C:\testtestest.txt", betaFileLine);
}

---

包含接受单个字符串作为参数而不是字符串数组

一种简单的方法是循环遍历onlyThese并将contains语句嵌套在其中：

string[] onlythese = {@"apple/",@"aee/",@"www/",@"blk/",@"art/",@"purp/",@"ora/",@"red/",@"brd/",@"biek/",@"biz/"};
foreach(string onlyThis in onlythese) 
{
    if (betaFileLine.Contains(onlyThis))
    {
        File.AppendAllText(@"C:\testtestest.txt", betaFileLine);
        break;
    }
}

---

如果您有Framework 3.5，请使用LINQ

if(onlythese.Any(s => betaFileLine.Contains(s)))
{
    File.AppendAllText(@"C:\testtestest.txt", betaFileLine);
}

如果不是，则必须循环每个字符串

bool match = false;

foreach(String thisString in onlyThese)
{
    if(betaFileLine.Contains(thisString)
    {
        match = true;
        break;
    }
}

if(match)
    File.AppendAllText(@"C:\testtestest.txt", betaFileLine);

或者使用正则表达式

string onlyThese = @"apple/|aee/|www/|blk/|art/|purp/|ora/|red/|brd/|biek/|biz/";
if (Regex.IsMatch(betaFileLine, onlyThese))
    File.AppendAllText(@"C:\testtestest.txt", betaFileLine);

---

你想用什么来定义包含任何字符串的行，或者包含所有字符串的行？别忘了正则表达式：）这可能会成为一条代码线，呵呵。是的，保留我的重复答案毫无意义。这将为每一个匹配添加一行，而不是任何匹配。

string onlyThese = @"apple/|aee/|www/|blk/|art/|purp/|ora/|red/|brd/|biek/|biz/";
if (Regex.IsMatch(betaFileLine, onlyThese))
    File.AppendAllText(@"C:\testtestest.txt", betaFileLine);