Update Expression To Sql

Src/Asp.Net/SqlSugar/ExpressionsToSql/Subquery/Items/SubAvg.cs

@@ -0,0 +1,44 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Linq.Expressions;
+using System.Text;
+
+namespace SqlSugar
+{
+    public class SubAvg: ISubOperation
+    {
+        public string Name
+        {
+            get
+            {
+                return "Avg";
+            }
+        }
+
+        public Expression Expression
+        {
+            get; set;
+        }
+
+
+        public int Sort
+        {
+            get
+            {
+                return 200;
+            }
+        }
+
+        public ExpressionContext Context
+        {
+            get; set;
+        }
+
+        public string GetValue(Expression expression = null)
+        {
+            var exp = expression as MethodCallExpression;
+            return "AVG(" + SubTools.GetMethodValue(this.Context, exp.Arguments[0], ResolveExpressType.FieldSingle) + ")";
+        }
+    }
+}

Src/Asp.Net/SqlSugar/ExpressionsToSql/Subquery/Items/SubSum.cs

@@ -0,0 +1,44 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Linq.Expressions;
+using System.Text;
+
+namespace SqlSugar
+{
+    public class SubSum:ISubOperation
+    {
+        public string Name
+        {
+            get
+            {
+                return "Sum";
+            }
+        }
+
+        public Expression Expression
+        {
+            get; set;
+        }
+
+
+        public int Sort
+        {
+            get
+            {
+                return 200;
+            }
+        }
+
+        public ExpressionContext Context
+        {
+            get; set;
+        }
+
+        public string GetValue(Expression expression = null)
+        {
+            var exp = expression as MethodCallExpression;
+            return "SUM("+SubTools.GetMethodValue(this.Context, exp.Arguments[0], ResolveExpressType.FieldSingle)+")";
+        }
+    }
+}

Src/Asp.Net/SqlSugar/ExpressionsToSql/Subquery/Subquerable.cs

@@ -21,10 +21,15 @@ namespace SqlSugar
         {
             return this;
         }
+
         public TResult Select<TResult>(Func<T, TResult> expression) where TResult :struct
         {
             return default(TResult);
         }
+        public Byte[] Select(Func<T, Byte[]> expression) 
+        {
+            return null;
+        }
         public string Select(Func<T, string> expression) 
         {
             return default(string);
@@ -34,19 +39,54 @@ namespace SqlSugar
         {
             return default(TResult);
         }
-
+        public Byte[] Max(Func<T, Byte[]> expression)
-        public TResult Min<TResult>(Func<T, TResult> expression) where TResult : struct
         {
-            return default(TResult);
+            return null;
         }
         public string Max(Func<T, string> expression)
         {
             return default(string);
         }
+
         public string Min(Func<T, string> expression)
         {
             return default(string);
         }
+        public TResult Min<TResult>(Func<T, TResult> expression) where TResult : struct
+        {
+            return default(TResult);
+        }
+        public Byte[] Min(Func<T, Byte[]> expression)
+        {
+            return null;
+        }
+
+
+        public string Sum(Func<T, string> expression)
+        {
+            return default(string);
+        }
+        public TResult Sum<TResult>(Func<T, TResult> expression) where TResult : struct
+        {
+            return default(TResult);
+        }
+        public Byte[] Sum(Func<T, Byte[]> expression)
+        {
+            return null;
+        }
+
+        public string Avg(Func<T, string> expression)
+        {
+            return default(string);
+        }
+        public TResult Avg<TResult>(Func<T, TResult> expression) where TResult : struct
+        {
+            return default(TResult);
+        }
+        public Byte[] Avg(Func<T, Byte[]> expression)
+        {
+            return null;
+        }
 
         public bool Any()
         {

Src/Asp.Net/SqlSugar/SqlSugar.csproj

@@ -87,6 +87,8 @@
     <Compile Include="ExpressionsToSql\Subquery\Items\SubFromTable.cs" />
     <Compile Include="ExpressionsToSql\Subquery\Items\SubAny.cs" />
     <Compile Include="ExpressionsToSql\Subquery\Items\SubBegin.cs" />
+    <Compile Include="ExpressionsToSql\Subquery\Items\SubAvg.cs" />
+    <Compile Include="ExpressionsToSql\Subquery\Items\SubSum.cs" />
     <Compile Include="ExpressionsToSql\Subquery\Items\SubMin.cs" />
     <Compile Include="ExpressionsToSql\Subquery\Items\SubMax.cs" />
     <Compile Include="ExpressionsToSql\Subquery\Items\SubOrderBy.cs" />