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;
using Newtonsoft.Json;
namespace Youtube_Player
{
public partial class Authentication : Form
{
public static string AuthenticationApplicationDirectory;
public static string AuthenticationFileName = "Authentication.txt";
StreamWriter w;
public static bool formclosed = false;
static Authentication()
{
AuthenticationApplicationDirectory = Path.GetDirectoryName(Application.LocalUserAppDataPath) + "Authentication";
if (!Directory.Exists(AuthenticationApplicationDirectory))
{
Directory.CreateDirectory(AuthenticationApplicationDirectory);
}
AuthenticationFileName = Path.Combine(AuthenticationApplicationDirectory, AuthenticationFileName);
if (!File.Exists(AuthenticationFileName))
File.Create(AuthenticationFileName);
}
public Authentication()
{
InitializeComponent();
cTextBox1.Text = Form1.AuthenticationValues.ApiKey;
cTextBox2.Text = Form1.AuthenticationValues.UserId;
cTextBox3.Text = Form1.AuthenticationValues.JsonFileDirectory;
label1.Visible = false;
button1.Enabled = false;
button4.Enabled = false;
cTextBox2.WaterMarkForeColor = Color.Blue;
cTextBox3.WaterMarkForeColor = Color.Green;
cTextBox2.WaterMarkActiveForeColor = Color.Blue;
cTextBox3.WaterMarkActiveForeColor = Color.Green;
cTextBox1.ForeColor = Color.Red;
cTextBox2.ForeColor = Color.Blue;
cTextBox3.ForeColor = Color.Green;
cTextBox1.WaterMark = "Enter Api Key";
cTextBox2.WaterMark = "Enter Email Account";
cTextBox3.WaterMark = "Browse To The Json File Location";
}
private void Authentication_Load(object sender, EventArgs e)
{
}
private void cTextBox1_TextChanged(object sender, EventArgs e)
{
if (cTextBox1.Text != "Enter Api Key" && cTextBox1.Text != "")
{
button1.Enabled = true;
}
else
{
button1.Enabled = false;
}
}
private void cTextBox2_TextChanged(object sender, EventArgs e)
{
if (cTextBox2.Text != "Enter Email Account" && cTextBox2.Text != "")
{
button4.Enabled = true;
}
else
{
button4.Enabled = false;
}
}
private void cTextBox3_TextChanged(object sender, EventArgs e)
{
if (cTextBox3.Text != "Browse To The Json File Location" && cTextBox3.Text != "")
button6.Enabled = false;
}
private void button1_Click(object sender, EventArgs e)
{
button1.Text = "Confirmed";
button1.Enabled = false;
label1.Text = "Updating Settings File";
label1.Visible = true;
if (label1.Visible == true)
{
button6.Enabled = false;
button4.Enabled = false;
button1.Enabled = false;
}
FileInfo fi = new FileInfo(AuthenticationFileName);
if (fi.Length == 0)
{
w = new StreamWriter(AuthenticationFileName, true);
w.WriteLine("Api" + "=" + cTextBox1.Text);
w.Close();
}
else
{
w = new StreamWriter(AuthenticationFileName);
w.WriteLine("Api" + "=" + cTextBox1.Text);
w.Close();
}
timer1.Start();
}
private void button4_Click(object sender, EventArgs e)
{
button4.Enabled = false;
label1.Text = "Updating Settings File";
label1.Visible = true;
if (label1.Visible == true)
{
button6.Enabled = false;
button4.Enabled = false;
button1.Enabled = false;
}
w = new StreamWriter(AuthenticationFileName, true);
w.WriteLine("UserId" + "=" + cTextBox2.Text);
w.Close();
timer1.Start();
}
private void button6_Click(object sender, EventArgs e)
{
OpenFileDialog openFileDialog1 = new OpenFileDialog();
openFileDialog1.InitialDirectory = "c:\\";
openFileDialog1.Filter = "Json Files (*.json)|*.json";
openFileDialog1.FilterIndex = 0;
openFileDialog1.RestoreDirectory = true;
openFileDialog1.Multiselect = true;
if (openFileDialog1.ShowDialog() == DialogResult.OK)
{
cTextBox3.BackColor = Color.White;
cTextBox3.ForeColor = Color.Green;
cTextBox3.Text = openFileDialog1.FileName;
label1.Text = "Updating Settings File";
label1.Visible = true;
if (label1.Visible == true)
{
button6.Enabled = false;
button4.Enabled = false;
button1.Enabled = false;
}
w = new StreamWriter(AuthenticationFileName, true);
w.WriteLine("JsonFileDirectory" + "=" + cTextBox3.Text);
w.Close();
timer1.Start();
}
}
private void button2_Click(object sender, EventArgs e)
{
ResetValues(true);
}
int count = 0;
private void timer1_Tick(object sender, EventArgs e)
{
count += 1;
if (count == 2)
{
label1.Visible = false;
timer1.Stop();
count = 0;
}
}
private void Authentication_FormClosing(object sender, FormClosingEventArgs e)
{
ResetValues(false);
}
private void ResetValues(bool DeleteFile)
{
cTextBox1.Text = "";
cTextBox2.Text = "";
cTextBox3.Text = "";
button1.Text = "Confirm";
button4.Text = "Confirm";
button6.Enabled = true;
timer1.Stop();
count = 0;
if (DeleteFile == true)
{
if (File.Exists(AuthenticationFileName))
File.Delete(AuthenticationFileName);
}
Form1.AuthenticationValues.ApiKey = "";
Form1.AuthenticationValues.JsonFileDirectory = "";
Form1.AuthenticationValues.UserId = "";
if (Form1.AuthenticationValues.AuthenticationMenu.Enabled
== false && (Form1.lines.Length < 3 && Form1.lines.Length > 0))
Form1.AuthenticationValues.AuthenticationMenu.Enabled = true;
formclosed = true;
}
}
}
在检查现有文件时，第一个问题出在构造函数中：
if (!File.Exists(AuthenticationFileName))
File.Create(AuthenticationFileName);
这使文件忙于使用。稍后在我的代码中我试图再次使用该文件写入它时，我发现该文件正被另一个进程使用的异常。
第二个问题是在我尝试写入文件的3个地方。 第一名：
w = new StreamWriter(AuthenticationFileName, true);
w.WriteLine("Api" + "=" + cTextBox1.Text);
w.Close();
然后在代码中的另一个地方，我再次写入文件：
w = new StreamWriter(AuthenticationFileName, true);
w.WriteLine("UserId" + "=" + cTextBox2.Text);
w.Close();
最后：
w = new StreamWriter(AuthenticationFileName, true);
w.WriteLine("JsonFileDirectory" + "=" + cTextBox3.Text);
w.Close();
问题首先是文件正忙于使用，因为检查是否存在我在构造函数中进行的操作。
第二个问题是，我希望如果在文件中没有以＆＃34; Api＆＃34;开头的行。然后写下Api部分：
w.WriteLine("Api" + "=" + cTextBox1.Text);
但是如果它确实存在并且在textBox cTextBox1.Text中更改了文本我想要将更改的文本写入文件到Api行所在的位置。并附加一条新的Api线。
对于我写入文件的所有其他两个地方也是如此。 如果我将它全部弄错，不要在写入时appen，它将每次写一行并覆盖该行。 但是，如果我做的是真的，它会附加许多Api线或许多UserId线。 我希望每个人都有时间用textBox替换该行，只在这一行覆盖，但是用新文本覆盖。
如果在cTextBox1中有文本：Hello World 然后我改为：Hello World Now 然后用Hello World Now替换Api行Hello World
答案 0 :(得分：1)
好的，解决你的主要问题：
File.CreateFile实际上会打开一个文件流供您使用。最简单的解决方法是使用File.CreateFile（）。关闭（）以在完成后关闭它。
接下来，您正在尝试更改文件中的数据，但您从未读过它以查找信息。
您可以查找StreamReader并使用它，并解析数据并找出其中的位置，但有一个更明显的选择：每次都重写所有信息。