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我把这段代码放在一起,想知道如何从 .config 或 .ini 文件中调用某些数据。我已经研究过 AppSettings 和 ConfigurationManager 但对于菜鸟大脑来说计算太多了:-)

我已将 system.configuration 引用类添加到引用类列表中。基本上,我希望 MySQL 的变量存储在外部文件中,最终用户可以稍后更改。我不能把整个代码,因为它说我已经超过 3000 行或什么的。

DBServer = RemoteServer

dataBase = myDatabase

user = root

password = [the password here]

我已经用app.config尝试了以下代码,但仍然没有

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <connectionStrings>
    <add name="constring" connectionString="server=localhost; database=SchoolDB; user     id=root; password=Pa55w0rd;"/>
  </connectionStrings>
</configuration>

Mainwindow.cs中替换了以下内容

string constring = "datasource=localhost;port=3306;username=root;password=Pa55w0rd";

有了这个

string constring = ConfigurationManager.ConnectionStrings["dbconnectionstring"].ConnectionString;

然后我得到这个错误

“你调用的对象是空的”

好的,这是Mainwindow.cs

public partial class Portal : Form
{      
    public Portal(string UserName)
    {
        InitializeComponent();
        lbl_username.Text = UserName;
        timer1.Start();
        txt_staff_password1.PasswordChar = '*';
        load_loan_laptops();            
    }
    DataTable dbdataset;

    void load_loan_laptops()
    {
        //string constring = "datasource=localhost;port=3306;username=root;    password=Pa55w0rd";
        string constring =     ConfigurationManager.ConnectionStrings["constring"].ConnectionString;
        string Query = "Select * from schooldb.loans where Avail = 'yes';";
        MySqlConnection conDataBase = new MySqlConnection(constring);
        MySqlCommand cmdDataBase = new MySqlCommand(Query, conDataBase);
        MySqlDataReader myReader;

        try
        {
            conDataBase.Open();
            myReader = cmdDataBase.ExecuteReader();

            while (myReader.Read())
            {
                string devices = myReader.GetString("Device_Name");
                cmb_acer_loan.Items.Add(devices);
            }
        }
        catch (Exception ex)
        {
            MessageBox.Show(ex.Message);
        }
        conDataBase.Close();
    }

请有人帮助解决这个问题。

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1 回答 1

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问题:您的app.config文件有 <connectionString>标签而不是<connectionStrings> 标签。

解决方案:在文件中 替换<connectionString>with<connectionStrings></connectionString>with</connectionStrings>app.config

尝试这个:

应用程序配置

  <?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <connectionStrings>
    <add name="constring" connectionString="datasource=localhost;port=3306;username=root;password=Pa55w0rd"/>
      </connectionStrings>
</configuration>

代码:

string constring = ConfigurationManager.ConnectionStrings["constring"].ConnectionString;
于 2013-11-30T08:40:04.000 回答