如果参数数组出现null，则无法精确匹配，可按参数个数进行匹配

diff --git a/NewLife.Core/Reflection/EmitReflect.cs b/NewLife.Core/Reflection/EmitReflect.cs
index 4f0bcb2..53008db 100644
--- a/NewLife.Core/Reflection/EmitReflect.cs
+++ b/NewLife.Core/Reflection/EmitReflect.cs
@@ -1,4 +1,5 @@
 using System;
+using System.Linq;
 using System.Collections;
 using System.Collections.Generic;
 using System.Diagnostics;
@@ -27,8 +28,35 @@ namespace NewLife.Reflection
         /// <returns></returns>
         public override MethodInfo GetMethod(Type type, String name, params Type[] paramTypes)
         {
-            var method = base.GetMethod(type, name, paramTypes);
-            if (method != null) return method;
+            // 参数数组必须为空，或者所有参数类型都不为null，才能精确匹配
+            if (paramTypes == null || paramTypes.Length == 0 || paramTypes.All(t => t != null))
+            {
+                var method = base.GetMethod(type, name, paramTypes);
+                if (method != null) return method;
+            }
+
+            // 任意参数类型为null，换一种匹配方式
+            if (paramTypes.Any(t => t == null))
+            {
+                var ms = GetMethods(type, name, paramTypes.Length);
+                if (ms == null || ms.Length == 0) return null;
+
+                // 对比参数
+                foreach (var mi in ms)
+                {
+                    var ps = mi.GetParameters();
+                    var flag = true;
+                    for (int i = 0; i < ps.Length; i++)
+                    {
+                        if (paramTypes[i] != null && !ps[i].ParameterType.IsAssignableFrom(paramTypes[i]))
+                        {
+                            flag = false;
+                            break;
+                        }
+                    }
+                    if (flag) return mi;
+                }
+            }
 
             return TypeX.GetMethod(type, name, paramTypes);
         }

diff --git a/NewLife.Core/Reflection/IReflect.cs b/NewLife.Core/Reflection/IReflect.cs
index 0d8bd0e..4a92f65 100644
--- a/NewLife.Core/Reflection/IReflect.cs
+++ b/NewLife.Core/Reflection/IReflect.cs
@@ -1,4 +1,5 @@
 using System;
+using System.Linq;
 using System.Collections;
 using System.Collections.Generic;
 using System.ComponentModel;
@@ -26,6 +27,13 @@ namespace NewLife.Reflection
         /// <returns></returns>
         MethodInfo GetMethod(Type type, String name, params Type[] paramTypes);
 
+        /// <summary>获取指定名称的方法集合，支持指定参数个数来匹配过滤</summary>
+        /// <param name="type"></param>
+        /// <param name="name"></param>
+        /// <param name="paramCount">参数个数，-1表示不过滤参数个数</param>
+        /// <returns></returns>
+        MethodInfo[] GetMethods(Type type, String name, Int32 paramCount = -1);
+
         /// <summary>获取属性</summary>
         /// <param name="type">类型</param>
         /// <param name="name">名称</param>
@@ -182,6 +190,27 @@ namespace NewLife.Reflection
             return type.GetMethod(name, bf, null, paramTypes, null);
         }
 
+        /// <summary>获取指定名称的方法集合，支持指定参数个数来匹配过滤</summary>
+        /// <param name="type"></param>
+        /// <param name="name"></param>
+        /// <param name="paramCount">参数个数，-1表示不过滤参数个数</param>
+        /// <returns></returns>
+        public virtual MethodInfo[] GetMethods(Type type, String name, Int32 paramCount = -1)
+        {
+            var ms = type.GetMethods(bf);
+            if (ms == null || ms.Length == 0) return ms;
+
+            var list = new List<MethodInfo>();
+            foreach (var item in ms)
+            {
+                if (item.Name == name)
+                {
+                    if (paramCount >= 0 && item.GetParameters().Length == paramCount) list.Add(item);
+                }
+            }
+            return list.ToArray();
+        }
+
         /// <summary>获取属性</summary>
         /// <param name="type">类型</param>
         /// <param name="name">名称</param>

diff --git a/NewLife.Core/Reflection/Reflect.cs b/NewLife.Core/Reflection/Reflect.cs
index 05ecf01..0a4c13f 100644
--- a/NewLife.Core/Reflection/Reflect.cs
+++ b/NewLife.Core/Reflection/Reflect.cs
@@ -41,6 +41,18 @@ namespace NewLife.Reflection
             return _Provider.GetMethod(type, name, paramTypes);
         }
 
+        /// <summary>获取指定名称的方法集合，支持指定参数个数来匹配过滤</summary>
+        /// <param name="type"></param>
+        /// <param name="name"></param>
+        /// <param name="paramCount">参数个数，-1表示不过滤参数个数</param>
+        /// <returns></returns>
+        public static MethodInfo[] GetMethodsEx(this Type type, String name, Int32 paramCount = -1)
+        {
+            if (String.IsNullOrEmpty(name)) return null;
+
+            return _Provider.GetMethods(type, name, paramCount);
+        }
+
         /// <summary>获取属性。搜索私有、静态、基类，优先返回大小写精确匹配成员</summary>
         /// <param name="type">类型</param>
         /// <param name="name">名称</param>
@@ -128,13 +140,16 @@ namespace NewLife.Reflection
             {
                 Type t = null;
                 if (item != null) t = item.GetType();
+
                 list.Add(t);
             }
 
+            // 如果参数数组出现null，则无法精确匹配，可按参数个数进行匹配
             var method = GetMethodEx(type, name, list.ToArray());
             if (method == null) return false;
 
             value = Invoke(target, method, parameters);
+
             return true;
         }