代码:
using System;
using System.CodeDom;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using ADODB;
namespace ConsoleApp1
{
internal class Programre
{
static ADODB.Recordset recordsetInstance=new ADODB.Recordset();
static Connection connectionInstance=new Connection();
static void Main(string[] args)
{
string databaseFilePath = "D:\\database.mdb";
string tableName = "table";
string columnName = "columnName";
dynamic columnValue;
connectionInstance.ConnectionString = $"Provider=Microsoft.Jet.OLEDB.4.0;Data Source={databaseFilePath}";
connectionInstance.Open();
recordsetInstance.Open($"SELECT * FROM {tableName}", connectionInstance, CursorTypeEnum.adOpenForwardOnly, LockTypeEnum.adLockReadOnly);
columnValue = recordsetInstance.Fields[columnName].Value;
Console.WriteLine(columnValue.ToString());
connectionInstance.Close();
Console.ReadLine();
}
}
}
报错信息:
System.TypeLoadException
? HResult=0x80131522
? Message=未能从程序集“ConsoleApp1, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null”中加载类型“ADODB.FieldsToInternalFieldsMarshaler”。
? Source=mscorlib
? StackTrace:
? ?at System.StubHelpers.StubHelpers.CreateCustomMarshalerHelper(IntPtr pMD, Int32 paramToken, IntPtr hndManagedType)
? ?at ADODB._Recordset.get_Fields()
? ?at ConsoleApp1.Program.Main(String[] args) in C:\Users\hahah\Desktop\test\ConsoleApp1\Program.cs:line 20
解决方式:
代码不变,更换“Microsoft ActiveX Data Objects?Libray“COM组件版本为6.0解决。(原本VS给我自动引用的是2.x;更换方式为进入项目的引用窗体,选择COM节点,勾选对应COM组件即可。)