C# 如何在运行时将连接字符串保存在App.config文件中？

我试图在运行时将连接字符串保存在App.confing文件中，然后在应用程序运行时打开该文件，发现连接字符串已保存在该文件中，但在关闭应用程序后，连接字符串已自动删除

你能帮我把连接字符串保存在app.config文件中吗？ 我在表单中添加了两个文本框（txtServer和txtDatabase），并在用户单击时添加了一个按钮连接到数据库

Imports System.Data.SqlClient
Imports System.Text
Imports System.Configuration
Imports System.Xml

Public Class Form1

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
    Try
        Dim strConnectionStringName As String = "con"
        Dim Con As StringBuilder = New StringBuilder("Data Source=")
        Con.Append(txtServer.Text)
        Con.Append(";Initial Catalog=")
        Con.Append(txtDatabase.Text)
        Con.Append(";Integrated Security=SSPI;")
        Con.Append("User ID=username; Password=xyz;")

        Dim ConStringSettings As New ConnectionStringSettings(strConnectionStringName, Con.ToString)
        Dim Config As Configuration = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None)
        AddAndSaveOneConnectionStringSettings(Config, ConStringSettings)

        Catch ex As Exception
        MessageBox.Show(ConfigurationManager.ConnectionStrings("con").ToString() & _
            "This is invalid connection", "Incorrect server/Database.")
    End Try
End Sub

Public Sub AddAndSaveOneConnectionStringSettings(ByVal Config As Configuration, _
            ByVal ConStringSettings As ConnectionStringSettings)
    Dim ConStringsSection As ConnectionStringsSection = Config.ConnectionStrings
    ConStringsSection.ConnectionStrings.Add(ConStringSettings)
    Config.Save(ConfigurationSaveMode.Minimal)
    ConfigurationManager.RefreshSection("connectionStrings")
End Sub
End Class

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我认为您只需要指定强制保存：

ConStringsSection.SectionInformation.ForceSave = True

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查看以了解更多信息。

我尝试了您的解决方案，但没有任何更改，关闭应用程序后，连接字符串仍然从app.config文件中删除。