尝试创建try catch异常，如果找不到文件，则加载具有旧文件值的新文件，而不是 [英] trying to create a try catch exception where if a file can't be found a new file with values of the old file is loaded instead

问题描述

我有一个try catch异常，如果找不到dict.csv文件，则会出现一个消息框，并且将创建一个名为newdict.csv的新文件-如何将dict.csv文件的旧值加载到新文件?

I have a try catch exception where if the dict.csv file cant e found a messagebox will appear and a new file will be created called newdict.csv - How do I load the old value of the dict.csv file into the new file?

这些值是用户名和密码的列表吗?

The values being a list of usernames and passwords?

    try //checks for existing dict.csv file and reads it for key and value and checks against credentials
        {

            var data = File.ReadAllLines(@"C:\Users\Scott\Documents\dict.csv");//Reads all contents of a file and then closes the file once its been read
            foreach (var login in data)
            {
                var parts = login.Split(',');//creates a variable called data and loads it with the dict.csv file
                Credentials.Add(parts[0].Trim(), parts[1].Trim());//splites the key and value into [0] and [1] and trim removes leading and white space and applies ","
            }
        }
        catch (FileNotFoundException)//How do I load the newdict.csv with values of dict.csv?
        {
            MessageBox.Show("dict.csv file does not exist! Creating new file called newdict.csv", "Error!", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
            using (StreamWriter writer = File.AppendText(@"C:\Users\Scott\Documents\newdict.csv "))
            Credentials.Add("bob2", "password");                          
            Credentials.Add("user", "pass");
        }

推荐答案

如果您使用以下方法，我认为您会更好:

I think you would be better off if you used:

string[] newCredentials, data, parts;
if (!File.Exists(@"C:\Users\Scott\Documents\dict.csv"))
{
    //create .csv file
    newCredentials = new string[2];
    newCredentials[0] = "Bob2,password";
    newCredentials[1] = "user,pass";
    File.WriteAllLines(@"C:\Users\Scott\Documents\newdict.csv", newCredentials))
    Credentials.Add("bob2", "password");                          
    Credentials.Add("user", "pass");
}
else
{
    data = File.ReadAllLines(@"C:\Users\Scott\Documents\dict.csv");
    foreach(string login in data)
    {
        parts = login.Split(',');
        Credentials.Add(parts[0].Trim(), parts[1].Trim());
    }
}

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