的SQL Server Compact SDF文件 - 問題的SQLException

Question

所以現在運行該代碼行，這個問題是關係到這個以前SO question

我有固定的程序中使用的字符串。

爲什麼下面就行了myAdapt.Fill(mySet, "AvailableValues");失敗與錯誤SQLException was Unhandled; A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections

數據庫是該項目爲什麼應該有連接困難的一部分嗎？

• 我試過在sql文件中運行sql字符串，它運行正常。

• 我嘗試刪除DGV中的所有列。

  void PopulateGridView() 
  { 
      SqlConnection conn = new SqlConnection(ConfigurationManager.ConnectionStrings["DatabaseDGVexperiments.Properties.Settings.DatabaseDGVexperimentsConnStg"].ConnectionString); 
      SqlDataAdapter myAdapt = new SqlDataAdapter("SELECT refText FROM helloworld", conn); 
      DataSet mySet = new DataSet(); 
      myAdapt.Fill(mySet, "AvailableValues"); 
      DataTable myTable = mySet.Tables["AvailableValues"]; 
      this.uxExperimentDGV.DataSource = myTable; 
  } 
  

Answer 1

你試圖打開一個文件SQLCE（SDF）用的SqlConnection？
我想你應該使用一個和的SqlCeConnection ADO.NET類特定的SQL精簡

using System.Data.SqlServerCe; 
..... 

void PopulateGridView() 
{ 
    SqlCeConnection conn = new SqlCeConnection(ConfigurationManager.ConnectionStrings["DatabaseDGVexperiments.Properties.Settings.DatabaseDGVexperimentsConnStg"].ConnectionString); 
    SqlCeDataAdapter myAdapt = new SqlCeDataAdapter("SELECT refText FROM helloworld", conn); 
    DataSet mySet = new DataSet(); 
    myAdapt.Fill(mySet, "AvailableValues"); 
    DataTable myTable = mySet.Tables["AvailableValues"]; 
    this.uxExperimentDGV.DataSource = myTable; 
}