Question

我想对csv中的主机名执行ping操作，并将结果写在下一列中，但是我有点不知道该怎么做？

这是我得到的错误：错误CS0021无法将带有[]的索引应用于'StreamReader'类型的表达式

我唯一能做的就是向控制台写入csv中的内容。

    string filePath = @"c:\hostnames.csv";
    var reader = new StreamReader(filePath);
    Ping ping = new Ping();
    List<string> hostnames = new List<string>();
    while (!reader.EndOfStream)
    {
        var line = reader.ReadLine();
        var values = line.Split(',');
        hostnames.Add(values[0]);
        hostnames.ForEach(Console.WriteLine);
    }

    List<string> goodPing = new List<string>();
    foreach (string singleComputer in hostnames)
    {
        PingReply pingresult = ping.Send(singleComputer);

        if (pingresult.Status.ToString() == "Success")
        {
            goodPing.Add(singleComputer);
        }
    }
        var csv = new StringBuilder();
        var first = reader[0].ToString();   
        var newLine = string.Format("{0}");
        csv.AppendLine(newLine);
        File.WriteAllText(filePath, csv.ToString());
    }

Answer 1

目前尚不清楚您遇到的错误是什么，但是我注意到的一个问题是您没有为string.Format提供变量，我认为那里没有用。.

示例hostnames.csv是这样的：

www.google.com,www.somebadu-rlwhichcannot..com,www.stackoverflow.com

        var filePath = @"c:\test\hostnames.csv"; // change it to your source
        var filePathOutput = @"c:\test\hostnamesOutput.csv"; // use separate output file so you would not overwrite your source..
        var ping = new Ping();
        var hostNames = new List<string>();

        using (var reader = new StreamReader(filePath))
        {
            while (!reader.EndOfStream)
            {
                var line = reader.ReadLine();
                hostNames = line.Split(',').ToList();
            }
        }

        var goodPing = new List<string>();

        foreach (var singleComputer in hostNames)
            try
            {
                var pingResult = ping.Send(singleComputer);
                if (pingResult.Status == IPStatus.Success)
                {
                    goodPing.Add(singleComputer);
                }
            }
            catch (Exception e)
            {
                // host was not in a correct format or any other exception thrown....
                // do whatever error handling you want, logging etc...
            }

        var csv = new StringBuilder();

        foreach (var hostname in hostNames)
        {
            var resultText = goodPing.Contains(hostname) ? "Success" : "Failed";
            var newLine = string.Format("{0},{1}", hostname, resultText);
            csv.AppendLine(newLine);
        }

        File.WriteAllText(filePathOutput, csv.ToString());

我没有在IDE上尝试过，但是它应该在做您想做的事情。似乎您从某个地方复制粘贴了该代码，并试图在不了解的情况下对其进行操作。我建议确保在开始使用它之前先逐行理解它的用途，用法。否则，您将始终需要有人为您编写代码！

输出将（在Excel中）：

Answer 2

这是我想尝试做的事情的简化版本。

代码运行前的hostheaders.csv示例

www.google.com
www.stackoverflow.com
www.fakewebsitehere.com

更新的代码

string filePath = @"c:\hostnames.csv";
List<string> results = new List<string>();

using (var reader = new StreamReader(filePath))
{
    Ping ping = new Ping();

    while (!reader.EndOfStream)
    {
        var line = reader.ReadLine();
        var values = line.Split(',');
        var hostname = values[0];
        Console.WriteLine(hostname);

        PingReply pingresult = ping.Send(hostname);

        results.Add($"{line},{pingresult.Status.ToString()}");
    }
}

File.WriteAllLines(filePath, results);

代码运行后

hostheaders.csv

www.google.com,Success
www.stackoverflow.com,Success
www.fakewebsitehere.com,TimedOut

如何将结果写入csv？

2 个答案: