C#工厂模式（反射，接口，抽象类）

来源：互联网发布：上市公司捐赠数据编辑：程序博客网时间：2024/05/16 12:10

1、反射，接口，具体方法。

流程：UI传递信息到BLL层，BLL首先

IDBHelper dbhelper = ComDBHelper.GetDBHelper();或

private static IMerchantCoupons _accesser =Coupons_Access.CreateMerchantCoupon();

调用发射机制，加载数据库具体操作类的DLL文件实现接口（这里可以调用不同的DLL，实现相同的接口，DB,ORACLE,ACCESS数据库）。

2、反射类：

public static IDBHelper GetDBHelper(DatabaseType dbType)
{
IDBHelper dbhelper = null;
string path = AppDomain.CurrentDomain.SetupInformation.PrivateBinPath;
string dllName = "";
string allPathName = "";
switch (dbType)
{
case DatabaseType.MSSQL:
dllName = "DBSqlHelper.dll";
//已加载
if (assembly != null) {
return dbhelper = (IDBHelper)assembly.CreateInstance("DBSqlHelper.SqlHelper", true, BindingFlags.Default, null, new object[] { "MSSQLConnection" }, null, null);
}

allPathName = path +"/"+ dllName;
if (File.Exists(allPathName))
{
assembly = Assembly.LoadFile(allPathName);
dbhelper = (IDBHelper)assembly.CreateInstance("DBSqlHelper.SqlHelper", true, BindingFlags.Default, null, new object[] { "MSSQLConnection" }, null, null);
}
else
{
throw new Exception("未找到dll插件:" + allPathName + "\n请仔细检查检查(DBSqlHelper.dll)!");
}
break;
case DatabaseType.Oracle:
dllName = "DBOracleHelper.dll";
//已加载
if (assembly != null)
{
return dbhelper = (IDBHelper)assembly.CreateInstance("DBOracleHelper.OrclHelper", true, BindingFlags.Default, null, new object[] { "OracleConnection" }, null, null);
}

allPathName = path +"/"+ dllName;
if (File.Exists(allPathName))
{
assembly = Assembly.LoadFile(allPathName);
dbhelper = (IDBHelper)assembly.CreateInstance("DBOracleHelper.OrclHelper", true, BindingFlags.Default, null, new object[] { "OracleConnection" }, null, null);
}
else
{
throw new Exception("未找到dll插件:" + allPathName + ",请仔细检查检查(DBOracleHelper.dll)!");
}
break;
case DatabaseType.Access:
dllName = "DBAeccessHelper.dll";
//已加载
if (assembly != null)
{
return dbhelper = (IDBHelper)assembly.CreateInstance("DBAccesssHelper.AccHelper", true, BindingFlags.Default, null, new object[] { "AccessConnection" }, null, null);
}

allPathName = path +"/"+ dllName;
if (File.Exists(allPathName))
{
assembly = Assembly.LoadFile(allPathName);
dbhelper = (IDBHelper)assembly.CreateInstance("DBAccesssHelper.AccHelper", true, BindingFlags.Default, null, new object[] { "AccessConnection" }, null, null);
}
else
{
throw new Exception("未找到dll插件:" + allPathName + ",请仔细检查检查(DBAeccessHelper.dll)!");
}
break;
}
return dbhelper;
}

3、加载的文件必须实现接口所有方法。

0 0