Question

我需要帮助将字符串附加到路径。这里的问题是我声明的路径不能被调用，而只是给出正常的字符串值。这是我的代码。

public static string inputhistory1 = System.IO.Path.GetDirectoryName(Environment.GetCommandLineArgs()[0]) + "\\Log\\" + Process.GetCurrentProcess().ProcessName + DateTime.Now.ToString("yyyyMMdd")+".chf";
public static string inputhistory2 = System.IO.Path.GetDirectoryName(Environment.GetCommandLineArgs()[0]) + "\\Log\\FileExtact" + DateTime.Now.AddMonths(-1).ToString("yyyyMM") + ".chf";
public static string inputhistory3 = System.IO.Path.GetDirectoryName(Environment.GetCommandLineArgs()[0]) + "\\Log\\FileExtact" + DateTime.Now.AddMonths(-2).ToString("yyyyMM") + ".chf";
public static string inputhistory4 = System.IO.Path.GetDirectoryName(Environment.GetCommandLineArgs()[0]) + "\\Log\\FileExtact" + DateTime.Now.AddMonths(-3).ToString("yyyyMM") + ".chf";

public static bool checkfile(string filename)
{
    bool same = false;

    for (i = 1; i <= 4; i++)
    {
        string filechf = "inputhistory" + i;
        filechf = filechf;

        try
        {
            foreach (string line in System.IO.File.ReadAllLines(filechf))
            {
                if (line.Contains(filename))
                {
                    same = true;
                    break;
                }
                else
                {
                    same = false;
                }

                }
            }

        catch (Exception)
        {
            // Ignore if file does not exist.
        }

        if (same == true)
        {
            break;
        }
    }
}

Answer 1

这是因为您使用字符串filechf指定变量"inputhistory" + i。使用数组或列表存储输入历史记录值。

public static string inputhistory1 = System.IO.Path.GetDirectoryName(Environment.GetCommandLineArgs()[0]) + "\\Log\\" + Process.GetCurrentProcess().ProcessName + DateTime.Now.ToString("yyyyMMdd")+".chf";
public static string inputhistory2 = System.IO.Path.GetDirectoryName(Environment.GetCommandLineArgs()[0]) + "\\Log\\FileExtact" + DateTime.Now.AddMonths(-1).ToString("yyyyMM") + ".chf";
public static string inputhistory3 = System.IO.Path.GetDirectoryName(Environment.GetCommandLineArgs()[0]) + "\\Log\\FileExtact" + DateTime.Now.AddMonths(-2).ToString("yyyyMM") + ".chf";
public static string inputhistory4 = System.IO.Path.GetDirectoryName(Environment.GetCommandLineArgs()[0]) + "\\Log\\FileExtact" + DateTime.Now.AddMonths(-3).ToString("yyyyMM") + ".chf";

List<string> inputHistories = new List<string>();
inputHistories.Add(inputhistory1);
inputHistories.Add(inputhistory2);
inputHistories.Add(inputhistory3);
inputHistories.Add(inputhistory4);

然后您可以通过索引访问其值：

public static bool checkfile(string filename)
    {
        bool same = false;
        //try
        //{
        for (i = 0; i < inputHistories.Count; i++)
        {
            string filechf = inputHistories[i];
            try
            {
                foreach (string line in System.IO.File.ReadAllLines(filechf))
                {

                    if (line.Contains(filename))
                    {
                        same = true;
                        break;
                    }
                    else
                    {
                        same = false;
                    }

                }
            }
            catch (Exception)
            {
              //ignore if file does not exist
            }
            if (same == true)
            {
                break;
            }
        }

Answer 2

只是为了展示LINQ的表现力，以及利用现有工具的力量：

List<string> inputHistories = new List<string>
{
    inputhistory1, inputhistory2, inputhistory3, inputhistory4
};

public static bool checkfile(string filename)
{
    return inputHistories.Any(filename =>
        File.ReadLines(filename).Any(line => line.Contains(filename)));
}

Answer 3

有多种解决方案可能符合您的要求

您可以将变量存储在字典中：

var dictionary = new Dictionary<string,string>();
dictionary.Add("inputhistory1", inputhistory1);
dictionary.Add("inputhistory2", inputhistory2);
dictionary.Add("inputhistory3", inputhistory3);
dictionary.Add("inputhistory4", inputhistory4);
//use as below
Console.WriteLine(dictionary["inputhistory1"]);

或者您可以使用反射，以获取更多信息MSDN：

public class TestClass
{
    public static string inputhistory1 = "value1";
    public static string inputhistory2 = "value2";
    public static string inputhistory3 = "value3";
    public static string inputhistory4 = "value4";
}        
var obj = new TestClass();
var field = typeof (TestClass).GetField("inputhistory1");
//use as below
Console.WriteLine(field.GetValue(obj));

即使你可以使用switch / case来返回你的变量值

将路径追加到字符串

3 个答案: