已安装应用程序的 Visual Studio app.config 文件数据库路径

Question

我在我的应用程序中使用本地数据库，当我生成安装文件（由Installer Package）时，安装程​​序后会出现数据库路径错误。

示例

an attempt to attach an auto-named database for file....
//OR
The given path format is not supported

我尝试在app.config 文件中编辑数据库路径，但每次都失败，默认情况下我的代码行是这样的：

<add name="SampleDatabaseWalkthrough.Properties.Settings.SampleDatabaseConnectionString"
            connectionString="Data Source=(LocalDB)\MSSQLLocalDB;AttachDbFilename=|DataDirectory|\SampleDatabase.mdf;Integrated Security=True"
            providerName="System.Data.SqlClient" />

我的应用程序安装在C:\Program Files (86)\App_Folder\Setup 请注意，未来的用户可能会在自定义路径中安装它，所以我需要一种方法来获取已安装应用程序的动态路径。

我的问题是我怎样才能得到应用安装路径来替换这部分AttachDbFilename=|DataDirectory|\SampleDatabase.mdf？

Answer 1

您可以尝试使用AppDomain.CurrentDomain.SetData 方法来更改您的 mdf 文件路径。

既然，我不知道你是怎么发布winform项目的。

我建议你使用 Clickonce 来发布它。

首先，请将您的 mdf 文件包含在您的项目中。

其次，你可以试试下面的代码，在你发布后更改安装路径。

 private void Form1_Load(object sender, EventArgs e)
            {
                if(System.Deployment.Application.ApplicationDeployment.IsNetworkDeployed)
                {
                    string path = ApplicationDeployment.CurrentDeployment.DataDirectory; //Get installed path
                    AppDomain.CurrentDomain.SetData("DataDirectory", path);//set the DataDirectory 
                }
            }

最后，根据我的测试，我可以从 mdf 文件中获取信息，然后将它发布并安装到另一台计算机上。

Answer 2

在生产模式下|DataDirectory| 指的是“bin”目录，而不是“app_data”。如果你把.mdf文件放在app_data目录下，可以这样改：

|DataDirectory|\SampleDatabase.mdf 到 |DataDirectory|\app_data\SampleDatabase.mdf

<add name="SampleDatabaseWalkthrough.Properties.Settings.SampleDatabaseConnectionString"
        connectionString="Data Source=(LocalDB)\MSSQLLocalDB;AttachDbFilename=|DataDirectory|\app_data\SampleDatabase.mdf;Integrated Security=True"
        providerName="System.Data.SqlClient" />

更新1：

我正在发送一些代码。我只是想给你一个想法。您可以根据自己的情况进行更改。

private void Form1_Load(object sender, EventArgs e)
{
    if (!IsExist())
    {
        CreateDatabase();
        CreateTables();
    }
}

// Create the Database
private void CreateDatabase()
{
    string basePath = Environment.CurrentDirectory;
    string mdfFile = "TestDatabase.mdf";
    string ldfFile = "TestDatabase_Log.mdf";
    string mdfFullPath = System.IO.Path.Combine(basePath, "Data", mdfFile);
    string ldfFullPath = System.IO.Path.Combine(basePath, "Data", ldfFile);

    SqlConnection myConn = new SqlConnection("Server=.;Data Source=(LocalDB)\\MSSQLLocalDB;Integrated security=SSPI;database=master");
    string str = "CREATE DATABASE TestDatabase ON PRIMARY " +
            "(NAME = TestDatabase, " +
            $"FILENAME = '{mdfFullPath}', " +
            "SIZE = 2MB, MAXSIZE = 10MB, FILEGROWTH = 10%)" +
            "LOG ON (NAME = MyDatabase_Log, " +
            $"FILENAME = '{ldfFullPath}', " +
            "SIZE = 1MB, " +
            "MAXSIZE = 5MB, " +
            "FILEGROWTH = 10%)";


    SqlCommand myCommand = new SqlCommand(str, myConn);
    try
    {
        myConn.Open();
        myCommand.ExecuteNonQuery();
        MessageBox.Show("DataBase is Created Successfully", "MyProgram", MessageBoxButtons.OK, MessageBoxIcon.Information);
    }
    catch (System.Exception ex)
    {
        MessageBox.Show(ex.ToString(), "MyProgram", MessageBoxButtons.OK, MessageBoxIcon.Information);
    }
    finally
    {
        if (myConn.State == ConnectionState.Open)
        {
            myConn.Close();
        }
    }
}

// Create the tables and other stuff that you want
private void CreateTables()
{
    string conStr = @"Data Source=(LocalDB)\MSSQLLocalDB;AttachDbFilename=|DataDirectory|\Data\TestDatabase.mdf;Integrated Security=True;Connect Timeout=30";

    SqlConnection myConn = new SqlConnection(conStr);
    string str = @"CREATE TABLE [dbo].[TestTable]
                    (
                        [Id] INT NOT NULL PRIMARY KEY, 
                        [Test] NVARCHAR(50) NULL
                    )";

    SqlCommand myCommand = new SqlCommand(str, myConn);
    try
    {
        myConn.Open();
        myCommand.ExecuteNonQuery();
    }
    catch (Exception ex)
    {
        MessageBox.Show(ex.ToString(), "MyProgram", MessageBoxButtons.OK, MessageBoxIcon.Information);
    }
    finally
    {
        if (myConn.State == ConnectionState.Open)
        {
            myConn.Close();
        }
    }
}

// Check if there is the database
private bool IsExist()
{
    string basePath = Environment.CurrentDirectory;
    string mdfFile = "TestDatabase.mdf";
    string mdfFullPath = System.IO.Path.Combine(basePath, "Data", mdfFile);

    return System.IO.File.Exists(mdfFullPath);
}