定义返回值类型异常和返回值转换异常

src/Falcon.StoredProcedureRunner/ReturnTypeCastException.cs

@@ -0,0 +1,17 @@
+using System;
+
+namespace Falcon.StoredProcedureRunner
+{
+    /// <summary>
+    /// 返回类型转换异常
+    /// </summary>
+    public class ReturnTypeCastException:Exception
+    {
+        /// <summary>
+        /// 构造一个返回类型转换异常。
+        /// </summary>
+        /// <param name="ex">类型转换异常</param>
+        public ReturnTypeCastException(Exception ex)
+            : base("将存储过程返回结果转换为指定返回类型时发生错误！无法转换",ex) { }
+    }
+}

src/Falcon.StoredProcedureRunner/ReturnTypeException.cs

@@ -0,0 +1,16 @@
+using System;
+
+namespace Falcon.StoredProcedureRunner
+{
+    /// <summary>
+    /// 返回类型定义异常
+    /// </summary>
+    public class ReturnTypeException:Exception
+    {
+        /// <summary>
+        /// 构造一个返回类型错误异常
+        /// </summary>
+        public ReturnTypeException() : base("必须在参数类型上设置ReturnTypeAttribute或者通过合适重载明确指定返回数据类型。") {
+        }
+    }
+}

src/Falcon.StoredProcedureRunner/Runner.cs

@@ -4,8 +4,6 @@ using System.Data;
 using System.Data.Common;
 using System.Linq;
 using System.Reflection;
-using System.Runtime.CompilerServices;
-using System.Text;
 using Microsoft.Data.SqlClient;
 using Microsoft.EntityFrameworkCore;
 
@@ -44,7 +42,7 @@ namespace Falcon.StoredProcedureRunner
         public IEnumerable<object> Run<TPrarmType>(DbContext db,TPrarmType data) {
             var rType = getRequtnType(typeof(TPrarmType));
             if(rType == null) {
-                throw new Exception("必须在参数类型上设置ReturnTypeAttribute");
+                throw new ReturnTypeException();
             }
             return Run(db,typeof(TPrarmType),rType,data);
         }
@@ -58,7 +56,13 @@ namespace Falcon.StoredProcedureRunner
         /// <param name="data">参数数据</param>
         /// <returns>查询结果枚举</returns>
         public IEnumerable<TReturnType> Run<TPrarmType, TReturnType>(DbContext db,TPrarmType data) where TReturnType : class, new() {
+            try {
                 return Run(db,typeof(TPrarmType),typeof(TReturnType),data).Cast<TReturnType>();
+            } catch(InvalidCastException ice) {
+                throw new ReturnTypeCastException(ice);
+            } catch(Exception ex) {
+                throw ex;
+            }
         }
 
         /// <summary>
@@ -75,7 +79,7 @@ namespace Falcon.StoredProcedureRunner
             var connection = db.Database.GetDbConnection();
             using(var cmd = connection.CreateCommand()) {
                 cmd.CommandText = pm;
-                cmd.CommandType = System.Data.CommandType.StoredProcedure;
+                cmd.CommandType = CommandType.StoredProcedure;
                 cmd.Parameters.AddRange(paras);
                 connection.Open();
                 var dr = cmd.ExecuteReader();