How to handle file read and write errors in C#

How to handle file read and write errors in C# requires specific code examples

In C# programming, handling file read and write errors is a very important task. Whether reading a file or writing a file, there are some potential errors, such as the file does not exist, file permissions are insufficient, the file is occupied by other processes, etc. In order to ensure the robustness and user experience of the program, we need to handle these error conditions in advance. This article will introduce how to handle file read and write errors in C# and give corresponding code examples.

1. File reading error handling

Errors that may occur during file reading include file non-existence, file inaccessibility, etc. The following is a common processing method, using the try-catch statement to capture exceptions and perform different processing according to the specific exception type.

try
{
    string path = "C:\test.txt";
    string content = File.ReadAllText(path);
    // 文件读取成功，继续处理文件内容
    // ...
}
catch (FileNotFoundException)
{
    // 文件不存在的处理逻辑
    Console.WriteLine("文件不存在");
}
catch (UnauthorizedAccessException)
{
    // 文件无法访问的处理逻辑
    Console.WriteLine("文件无法访问");
}
catch (IOException)
{
    // 其他IO错误的处理逻辑
    Console.WriteLine("文件读取错误");
}
catch (Exception ex)
{
    // 其他未知错误的处理逻辑
    Console.WriteLine("未知错误：" + ex.Message);
}
finally
{
    // 可以在finally块中进行资源释放等清理操作
}

Different exception handling logic can be customized according to specific situations.

2. File writing error handling

During the file writing process, common errors include files being occupied by other processes, invalid file paths, etc. The following is a processing method, which also uses the try-catch statement to capture exceptions and perform different processing according to the specific exception type.

try
{
    string path = "C:\test.txt";
    string content = "Hello, World!";
    File.WriteAllText(path, content);
    // 文件写入成功，继续其他操作
    // ...
}
catch (IOException ex)
{
    if (ex is UnauthorizedAccessException || ex is ArgumentException || ex is PathTooLongException)
    {
        // 文件路径无效的处理逻辑
        Console.WriteLine("文件路径无效");
    }
    else if (ex is IOException || ex is NotSupportedException)
    {
        // 其他IO错误的处理逻辑
        Console.WriteLine("文件写入错误");
    }
    else
    {
        // 其他未知错误的处理逻辑
        Console.WriteLine("未知错误：" + ex.Message);
    }
}
finally
{
    // 可以在finally块中进行资源释放等清理操作
}

Similarly, different exception handling logic can be customized according to specific situations.

The above is a sample code for handling file read and write errors. In actual development, we need to choose appropriate exception handling methods based on specific business needs and error types, and provide users with friendly error prompts and solutions. Through reasonable error handling, we can improve the stability and user experience of the program and ensure the success of file read and write operations.

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