Add db.GetConnectionWithAttr

Src/Asp.Net/SqlSugar/Interface/ITenant.cs

@@ -21,6 +21,7 @@ namespace SqlSugar
         Task<DbResult<T>> UseTranAsync<T>(Func<Task<T>> action, Action<Exception> errorCallBack = null);
         void AddConnection(ConnectionConfig connection);
         SqlSugarProvider GetConnection(dynamic configId);
+        SqlSugarProvider GetConnectionWithAttr<T>();
         bool IsAnyConnection(dynamic configId);
 
         void Close();

Src/Asp.Net/SqlSugar/SqlSugarClient.cs

@@ -5,6 +5,7 @@ using System.Diagnostics;
 using System.Dynamic;
 using System.Linq;
 using System.Linq.Expressions;
+using System.Reflection;
 using System.Text;
 using System.Threading;
 using System.Threading.Tasks;
@@ -633,6 +634,13 @@ namespace SqlSugar
                 });
             }
         }
+        public SqlSugarProvider GetConnectionWithAttr<T>() 
+        {
+            var attr = typeof(T).GetCustomAttribute<TenantAttribute>();
+            Check.ExceptionEasy("not TenantAttribute", "不存在特性 TenantAttribute");
+            var configId = attr.configId;
+            return this.GetConnection(configId);
+        }
         public SqlSugarProvider GetConnection(dynamic configId)
         {
             InitTenant();

Src/Asp.Net/SqlSugar/SqlSugarScope.cs

@@ -158,6 +158,10 @@ namespace SqlSugar
         {
             return ScopedContext.GetConnection(configId);
         }
+        public SqlSugarProvider GetConnectionWithAttr<T>()
+        {
+            return ScopedContext.GetConnectionWithAttr<T>();
+        }
 
         public DateTime GetDate()
         {

Src/Asp.Net/SqlSugar/Utilities/Check.cs

@@ -29,5 +29,9 @@ namespace SqlSugar
             if (isException)
                 throw new SqlSugarException(string.Format(message, args));
         }
+        public static void ExceptionEasy(string enMessage, string cnMessage)
+        {
+            throw new SqlSugarException(ErrorMessage.GetThrowMessage(enMessage, cnMessage));
+        }
     }
 }