代码外

Question

我正在使用2个Windows窗体和数据库连接执行C＃应用程序。代码中引用了该数据库的连接字符串，但我不希望它。

我想知道如何将该连接字符串保留在我的代码之外，因此如果必须更改某些内容，则该更改仅发生在程序之外。

希望我清楚自己。

感谢您的任何帮助。

Answer 1

您应该使用App.config定义连接字符串。如果您需要调用用户凭据，请务必按照文章中的说明加密连接字符串。

https://msdn.microsoft.com/en-us/library/ms254494%28v=vs.110%29.aspx?f=255&MSPPError=-2147217396

Answer 2

step 1

Just go to the "Properties" node then double-click on "Settings.Settings". You will then get a grid with columns for Name, Type, Scope and Value as in the following:

    第2步

Now, specify a name, then click in the Type cell. In the drop-down box choose "Connection String". Then set the Scope to "Application".

Step 3

Then click in the value cell and an ellipsis ("...") will appear in the right. Click on the ellipsis and create the connection string.

    然后在程序中，使用：Properties.Setting.Default。（name）访问（使用）连接字符串，其中（name）是您在名称列中提供的名称。

Example

In this example, we will display a record in a DataGridView on a button click.

Coding

Form1.cs[Design]

Form1.cs

[![enter image description here][5]][5]

App.config

You see that the Connection String is automatically included..

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
    <configSections>
    </configSections>
    <connectionStrings>
        <add name="ConnectionString.Properties.Settings.connection" connectionString="Data Source=MCNDESKTOP43;Initial Catalog=EmpDetail;Persist Security Info=True;User ID=sa;Password=*****"
            providerName="System.Data.SqlClient" />
    </connectionStrings>
    <startup>
        <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5" />
    </startup>
</configuration>


Output

[![enter image description here][5]][5]



  [1]: http://i.stack.imgur.com/hyNXF.jpg
  [2]: http://i.stack.imgur.com/4BJ5a.jpg
  [3]: http://i.stack.imgur.com/F3ViL.jpg
  [4]: http://i.stack.imgur.com/oGC5a.jpg
  [5]: http://i.stack.imgur.com/OZO22.jpg