Question

我有一个非常基本的C＃WinForms应用程序来生成随机数。代码如下所示：

private static double RandomNumber(double min, double max)
{
    Random random = new Random();
    var next = random.NextDouble();
    return min +(next * (max - min));
}

private void btnGenerate_Click(object sender, EventArgs e)
{
    var maxNum = Convert.ToDouble(txbInput.Text);
    var randomDec = Math.Round(RandomNumber(0, maxNum), 2);
    txbResult.Text = randomDec.ToString();
}

现在我想做的就是点击按钮，保存在本地保存的文件中生成的随机数，以及时间戳。

我是C＃的新手，对如何做到这一点知之甚少。因此，任何建议都将受到高度赞赏。

Answer 1

来自MSDN的明智之词：

// Example #2: Write one string to a text file. 
string text = "A class is the most powerful data type in C#. Like a structure, " +
               "a class defines the data and behavior of the data type. ";
// WriteAllText creates a file, writes the specified string to the file, 
// and then closes the file.
System.IO.File.WriteAllText(@"C:\Users\Public\TestFolder\WriteText.txt", text);

有关详细信息和示例，请参阅documentation。

修改我错过了时间戳，但是这里有很多值得回答的补充：）

Answer 2

要将文本保存到文件，您需要使用IO命名空间：

System.IO.File.AppendAllText(@"C:\Test.txt", txbResult && DateTime.Now.ToString());

这个东西向您展示了如何将字符串值写入文件。

编辑：添加了时间戳值。

Answer 3

这些示例显示了将文本写入文件的各种方法。前两个示例使用System.IO.File类上的静态方法将完整的字符串数组或完整的字符串写入文本文件。示例＃3显示了在写入文件之前必须单独处理每一行时如何向文件添加文本。示例1-3全部覆盖文件中的所有现有内容。示例＃4显示了如何将文本附加到现有文件。

class WriteTextFile
{
    static void Main()
    {

        // These examples assume a "C:\Users\Public\TestFolder" folder on your machine.
        // You can modify the path if necessary. 

        // Example #1: Write an array of strings to a file. 
        // Create a string array that consists of three lines. 
        string[] lines = { "First line", "Second line", "Third line" };
        // WriteAllLines creates a file, writes a collection of strings to the file, 
        // and then closes the file.
        System.IO.File.WriteAllLines(@"C:\Users\Public\TestFolder\WriteLines.txt", lines);


        // Example #2: Write one string to a text file. 
        string text = "A class is the most powerful data type in C#. Like a structure, " +
                       "a class defines the data and behavior of the data type. ";
        // WriteAllText creates a file, writes the specified string to the file, 
        // and then closes the file.
        System.IO.File.WriteAllText(@"C:\Users\Public\TestFolder\WriteText.txt", text);

        // Example #3: Write only some strings in an array to a file. 
        // The using statement automatically closes the stream and calls  
        // IDisposable.Dispose on the stream object. 
        using (System.IO.StreamWriter file = new System.IO.StreamWriter(@"C:\Users\Public\TestFolder\WriteLines2.txt"))
        {
            foreach (string line in lines)
            {
                // If the line doesn't contain the word 'Second', write the line to the file. 
                if (!line.Contains("Second"))
                {
                    file.WriteLine(line);
                }
            }
        }

        // Example #4: Append new text to an existing file. 
        // The using statement automatically closes the stream and calls  
        // IDisposable.Dispose on the stream object. 
        using (System.IO.StreamWriter file = new System.IO.StreamWriter(@"C:\Users\Public\TestFolder\WriteLines2.txt", true))
        {
            file.WriteLine("Fourth line");
        }
    }
}
 //Output (to WriteLines.txt): 
 //   First line 
 //   Second line 
 //   Third line 

 //Output (to WriteText.txt): 
 //   A class is the most powerful data type in C#. Like a structure, a class defines the data and behavior of the data type. 

 //Output to WriteLines2.txt after Example #3: 
 //   First line 
 //   Third line 

 //Output to WriteLines2.txt after Example #4: 
 //   First line 
 //   Third line 
 //   Fourth line

来自here

的参考资料

Answer 4

private void WriteData(double value)
{
    using (var file = new System.IO.StreamWriter(@"C:\file.txt", true))
    {
        file.WriteLine(string.Format("{0} {1}", value, DateTime.Now));
    }
}

您可以看到此链接msdn。得到时间 - DateTime.Now。

Answer 5

添加：

// using System.IO; string filepath = @"C:\test.txt"; //sample file name & location using (StreamWriter writer = new StreamWriter(filepath)) { writer.WriteLine(DateTime.Now.ToString() + " " + randomDec.ToString()); } // write your text in a string

在.Txt文件中存储来自WinForms App的数据

5 个答案: