app config连接路径

Question

我的程序在数据库路径已知时工作正常 但是当我将数据库的安装项目更改路径改为程序路径时

但是当我运行我的程序时会显示此消息

app.config代码是：

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
    <configSections>
    </configSections>
    <connectionStrings>
        <add name="ABB.Properties.Settings.ABBagain_CopyConnectionString"
            connectionString="Provider=Microsoft.ACE.OLEDB.12.0;Data Source=|DataDirectory|\ABB_againCopy-Copy.accdb;Persist Security Info=False;"
            providerName="System.Data.OleDb" />
        <add name="ABB.Properties.Settings.ABBagain_CopyConnectionString1"
            connectionString="Provider=Microsoft.ACE.OLEDB.12.0;Data Source=|DataDirectory|\ABB_againCopy-Copy.accdb;Persist Security Info=False;"
            providerName="System.Data.OleDb" />
        <add name="ABB.Properties.Settings.ABBagain_CopyConnectionString2"
            connectionString="Provider=Microsoft.ACE.OLEDB.12.0;Data Source=&quot;C:\Users\Es\Desktop\ABB amr\ABBagain-Copy.accdb&quot;"
            providerName="System.Data.OleDb" />
        <add name="ABB.Properties.Settings.ABB_againCopy_CopyConnectionString"
            connectionString="Provider=Microsoft.ACE.OLEDB.12.0;Data Source=&quot;C:\Users\Es\Desktop\final project\ABB_againCopy-Copy.accdb&quot;"
            providerName="System.Data.OleDb" />
        <add name="ABB.Properties.Settings.ABB_againCopy_CopyConnectionString1"
            connectionString="Provider=Microsoft.ACE.OLEDB.12.0;Data Source=&quot;C:\Users\AMR\Desktop\final project - Copy (2)\ABB_againCopy-Copy.accdb&quot;"
            providerName="System.Data.OleDb" />
        <add name="ABB.Properties.Settings.ABB_againCopy_CopyConnectionString2"
            connectionString="Provider=Microsoft.ACE.OLEDB.12.0;Data Source=|DataDirectory|\ABB_againCopy-Copy.accdb;Persist Security Info=False;"
            providerName="System.Data.OleDb" />
    </connectionStrings>
  <startup>
    <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5" />
  </startup>
</configuration>

和连接字符串：

string connString = ConfigurationManager.ConnectionStrings["ABB_againCopy-Copy"].ConnectionString;

Answer 1

没有名称为ABB_againCopy-Copy的连接字符串。这就是您收到此错误消息的原因。

此外，您的连接字符串包含大量的绒毛，这使得很难找到合适的连接字符串。

此：

ABB.Properties.Settings.ABB_againCopy_CopyConnectionString1

可能/应该是：

ABB_againCopy-Copy