如何保留上次使用的文件夹并在表单打开时将其放入文本框中?

Question

加载 C# 窗体时，我希望文本框中有一个属于默认登录用户的文件夹。

我有用于输入和输出文件的文本框和按钮，当打开表单时，我希望用户看到他保存上一个输出文件的默认文件夹。

我该怎么做？

Answer 1

双击解决方案资源管理器中项目Properties部分中的Settings.settings。

它将打开包含网格视图的参数向导。

在底部，添加一个名为例如LastPath的参数，并将其设置为string类型，然后选择可以为空的默认值。

如果选择将其设置为空(推荐(，请在静态Program类中添加以下变量：

static string UserDataFolderPath
= Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData)
+ Path.DirectorySeparatorChar
+ AssemblyCompany
+ Path.DirectorySeparatorChar
+ AssemblyTitle
+ Path.DirectorySeparatorChar;
static string UserDocumentsFolderPath
= Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments)
+ Path.DirectorySeparatorChar
+ AssemblyCompany
+ Path.DirectorySeparatorChar
+ AssemblyTitle
+ Path.DirectorySeparatorChar;

而这些方法：

static public string AssemblyCompany
{
get
{
object[] attributes = Assembly.GetExecutingAssembly()
.GetCustomAttributes(typeof(AssemblyCompanyAttribute), false);
if ( attributes.Length == 0 )
{
return "";
}
return ( (AssemblyCompanyAttribute)attributes[0] ).Company;
}
}
static public string AssemblyTitle
{
get
{
object[] attributes = Assembly.GetExecutingAssembly()
.GetCustomAttributes(typeof(AssemblyTitleAttribute), false);
if ( attributes.Length > 0 )
{
AssemblyTitleAttribute titleAttribute = (AssemblyTitleAttribute)attributes[0];
if ( titleAttribute.Title != "" )
{
return titleAttribute.Title;
}
}
return Path.GetFileNameWithoutExtension(Assembly.GetExecutingAssembly().CodeBase);
}
}

在Main方法的开头添加：

Directory.CreateDirectory(UserDataFolderPath);
Directory.CreateDirectory(UserDocumentsFolderPath);
if ( Properties.Settings.Default.LastPath == "" )
{
Properties.Settings.Default.LastPath = UserDataFolderPath;
Properties.Settings.Default.Save();
}

现在要获得它，您可以在表单的FormLoad事件中写入：

textBox1.Text = Properties.Settings.Default.LastPath;

放入FormClosed事件：

Properties.Settings.Default.LastPath = textBox1.Text;
Properties.Settings.Default.Save();

在这里，您应该Program.cs

：

using System;
using System.IO;
using System.Reflection;
using System.Windows.Forms;
namespace WindowsFormsAppTest
{
static class Program
{
[STAThread]
static void Main()
{
Directory.CreateDirectory(UserDataFolderPath);
Directory.CreateDirectory(UserDocumentsFolderPath);
if ( Properties.Settings.Default.LastPath == "" )
{
Properties.Settings.Default.LastPath = UserDataFolderPath;
Properties.Settings.Default.Save();
}
Application.EnableVisualStyles();
Application.SetCompatibleTextRenderingDefault(false);
Application.Run(new FormTest());
}
static string UserDataFolderPath
= Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData)
+ Path.DirectorySeparatorChar
+ AssemblyCompany
+ Path.DirectorySeparatorChar
+ AssemblyTitle
+ Path.DirectorySeparatorChar;
static string UserDocumentsFolderPath
= Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments)
+ Path.DirectorySeparatorChar
+ AssemblyCompany
+ Path.DirectorySeparatorChar
+ AssemblyTitle
+ Path.DirectorySeparatorChar;
static public string AssemblyCompany
{
get
{
object[] attributes = Assembly.GetExecutingAssembly()
.GetCustomAttributes(typeof(AssemblyCompanyAttribute), false);
if ( attributes.Length == 0 )
{
return "";
}
return ( (AssemblyCompanyAttribute)attributes[0] ).Company;
}
}
static public string AssemblyTitle
{
get
{
object[] attributes = Assembly.GetExecutingAssembly()
.GetCustomAttributes(typeof(AssemblyTitleAttribute), false);
if ( attributes.Length > 0 )
{
AssemblyTitleAttribute titleAttribute = (AssemblyTitleAttribute)attributes[0];
if ( titleAttribute.Title != "" )
{
return titleAttribute.Title;
}
}
return Path.GetFileNameWithoutExtension(Assembly.GetExecutingAssembly().CodeBase);
}
}
}
}

和你的Form.cs：

using System;
using System.Windows.Forms;
namespace WindowsFormsAppTest
{
public partial class FormTest : Form
{
public FormTest()
{
InitializeComponent();
}
private void FormTest_Load(object sender, EventArgs e)
{
textBox1.Text = Properties.Settings.Default.LastPath;
}
private void FormTest_FormClosed(object sender, FormClosedEventArgs e)
{
Properties.Settings.Default.LastPath = textBox1.Text;
Properties.Settings.Default.Save();
}
}
}