如何在 C# 中更新 app.config 连接字符串数据源值? [英] How can i update app.config connectionstring Datasource value in C#?

问题描述

Configuration config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
config.ConnectionStrings.ConnectionStrings["MyConnectionString",String.Format("DataSource={0};")].ConnectionString=textBox1.Text;
config.Save(ConfigurationSaveMode.Modified, true);
ConfigurationManager.RefreshSection("connectionStrings");

我在第二行遇到了问题.我似乎无法获得正确的语法.如您所见，我只想更新 DataSource 值.例如，如果当前值是 Data Source=PC001\SQL2008EXPRESS，我希望它更新为客户端在 textBox1 中输入的内容.

I'm having trouble at line two. I cant seem to get the syntax correct. As you can see, i only want to update the DataSource value only. For example, if current value is Data Source=PC001\SQL2008EXPRESS, i want it to be updated to what the client enters in textBox1.

连接字符串示例

<add name="ERPDatabaseTables" connectionString="metadata=res://*/ERPTables.csdl|res://*/ERPTables.ssdl|res://*/ERPTables.msl;provider=System.Data.SqlClient;provider connection string=&quot;Data Source=PC001\SQL2008EXPRESS;Initial Catalog=MyDatabase.mdf;Integrated Security=True;MultipleActiveResultSets=True&quot;" providerName="System.Data.EntityClient"/>

所以只想更新Data Source=PC001\SQL2008EXPRESS部分

推荐答案

你真正想要的是:

Configuration config = 
    ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);

// Because it's an EF connection string it's not a normal connection string
// so we pull it into the EntityConnectionStringBuilder instead
EntityConnectionStringBuilder efb = 
    new EntityConnectionStringBuilder(
        config.ConnectionStrings.ConnectionStrings["ERPDatabaseTables"]
            .ConnectionString);

// Then we extract the actual underlying provider connection string
SqlConnectionStringBuilder sqb = 
    new SqlConnectionStringBuilder(efb.ProviderConnectionString);

// Now we can set the datasource
sqb.DataSource = textBox1.Text;

// Pop it back into the EntityConnectionStringBuilder 
efb.ProviderConnectionString = sqb.ConnectionString;

// And update...
config.ConnectionStrings.ConnectionStrings["ERPDatabaseTables"]
    .ConnectionString = efb.ConnectionString;

config.Save(ConfigurationSaveMode.Modified, true);
ConfigurationManager.RefreshSection("connectionStrings");

假设:

1. 您的 EF 连接字符串存在于应用的配置文件中

1. Your EF connection string exists in the app's config file

您有对 System.Data.Entity

这篇关于如何在 C# 中更新 app.config 连接字符串数据源值?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！