如何阅读和放大器;写入二进制文件在C＃？ [英] How Do I Read & Write Binary Files In C#?

问题描述

我想C＃编写的应用程序，将数据写入到一个二进制文件，然后读取它。问题是，当我尝试读它，应用程序的错误崩溃无法读取超出流的末尾。

这里的code：

 使用系统;
使用System.Collections.Generic;
使用System.ComponentModel;
使用System.Data这;
使用System.Drawing中;
使用System.Linq的;
使用System.Text;
使用System.Threading.Tasks;
使用System.Windows.Forms的;
使用System.IO;命名空间Read_And_Write_To_Binary
{
    公共部分Form1类：表格
    {
        公共Form1中（）
        {
            的InitializeComponent（）;
        }        私人无效btnSave_Click（对象发件人，EventArgs的发送）
        {
            SaveFileDialog SaveFileDialog =新SaveFileDialog（）;
            SaveFileDialog.Title =另存为...;
            SaveFileDialog.Filter =二进制文件（* .bin文件）| * .bin文件;
            SaveFileDialog.InitialDirectory = @C：\\;
            如果（SaveFileDialog.ShowDialog（）== DialogResult.OK）
            {
                的FileStream FS =新的FileStream（SaveFileDialog.FileName，FileMode.Create）;
                //创建数据的作家。
                的BinaryWriter体重=新的BinaryWriter（FS）;                字符串名称= Convert.ToString（txtName.Text）;
                INT年龄= Convert.ToInt32（txtAge.Text）;
                bw.Write（姓名）;
                bw.Write（年龄）;                fs.Close（）;
                bw.Close（）;
            }
         }        私人无效btnOpen_Click（对象发件人，EventArgs的发送）
        {
            打开文件对话框打开文件对话框=新的OpenFileDialog（）;
            OpenFileDialog.Title =打开文件...;
            OpenFileDialog.Filter =二进制文件（* .bin文件）| * .bin文件;
            OpenFileDialog.InitialDirectory = @C：\\;
            如果（OpenFileDialog.ShowDialog（）== DialogResult.OK）
            {
                的FileStream FS =新的FileStream（OpenFileDialog.FileName，FileMode.Create）;
                BinaryReader BR =新BinaryReader（FS）;                lblName.Text = br.ReadString（）;
                lblAge.Text = br.ReadInt32（）;                fs.Close（）;
                br.Close（）;
            }
        }
    }
}
 

解决方案

您正在使用 FileMode.Create 阅读该文件。

您应该使用 FileMode.Open 代替。

 的FileStream FS =新的FileStream（SaveFileDialog.FileName，FileMode.Open）;
 

当您打开流来创建文件，现有的文件将被重写，所以你会得到这个例外。这是因为文件中没有可用的数据。

I'm trying to write an app in C# that will write data to a binary file and then read it. The problem is that when I try to read it, the app crashes with the error "Unable to read beyond the end of the stream."

Here's the code:

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.IO;

namespace Read_And_Write_To_Binary
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void btnSave_Click(object sender, EventArgs e)
        {
            SaveFileDialog SaveFileDialog = new SaveFileDialog();
            SaveFileDialog.Title = "Save As...";
            SaveFileDialog.Filter = "Binary File (*.bin)|*.bin";
            SaveFileDialog.InitialDirectory = @"C:\";
            if (SaveFileDialog.ShowDialog() == DialogResult.OK)
            {
                FileStream fs = new FileStream(SaveFileDialog.FileName, FileMode.Create);
                // Create the writer for data.
                BinaryWriter bw = new BinaryWriter(fs);

                string Name = Convert.ToString(txtName.Text);
                int Age = Convert.ToInt32(txtAge.Text);
                bw.Write(Name);
                bw.Write(Age);

                fs.Close();
                bw.Close();
            }
         }

        private void btnOpen_Click(object sender, EventArgs e)
        {
            OpenFileDialog OpenFileDialog = new OpenFileDialog();
            OpenFileDialog.Title = "Open File...";
            OpenFileDialog.Filter = "Binary File (*.bin)|*.bin";
            OpenFileDialog.InitialDirectory = @"C:\";
            if (OpenFileDialog.ShowDialog() == DialogResult.OK)
            {
                FileStream fs = new FileStream(OpenFileDialog.FileName, FileMode.Create);
                BinaryReader br = new BinaryReader(fs);

                lblName.Text = br.ReadString();
                lblAge.Text = br.ReadInt32();

                fs.Close();
                br.Close();
            }
        }
    }
}

解决方案

You're using FileMode.Create for reading the file.

You should use FileMode.Open instead.

FileStream fs = new FileStream(SaveFileDialog.FileName, FileMode.Open);

When you open the stream for creating a file, the existing file will be rewritten, so you'll get this exception as there is no data available in the file.

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