-

Src/Asp.Net/SqlServerTest/Demos/1_Query.cs

@@ -36,6 +36,8 @@ namespace OrmTest.Demo
 
             var getAll7 = db.Queryable<Student>().Where(it => SqlFunc.Subqueryable<School>().Where(s => s.Id == it.Id).Any()).ToList();
 
+            var getAll9 = db.Queryable<Student>().Where(it => SqlFunc.Subqueryable<School>().Where(s => s.Id == it.Id).Count()==1).ToList();
+
             var getAll8= db.Queryable<Student>().Where(it => SqlFunc.Subqueryable<School>().Where(s => s.Id == it.Id).Where(s=>s.Name==it.Name).NotAny()).ToList();
 
             var getAll1 = db.Queryable<Student>().Where(it => it.Id == SqlFunc.Subqueryable<School>().Where(s => s.Id == it.Id).Select(s => s.Id)).ToList();

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

@@ -13,6 +13,5 @@ namespace SqlSugar
         string GetValue(Expression expression);
         int Sort { get; }
         Expression Expression { get; set; }
-
     }
 }

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

@@ -0,0 +1,43 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Linq.Expressions;
+using System.Text;
+
+namespace SqlSugar
+{
+    public class SubCount: ISubOperation
+    {
+        public string Name
+        {
+            get
+            {
+                return "Count";
+            }
+        }
+
+        public Expression Expression
+        {
+            get; set;
+        }
+
+
+        public int Sort
+        {
+            get
+            {
+                return 200;
+            }
+        }
+
+        public ExpressionContext Context
+        {
+            get; set;
+        }
+
+        public string GetValue(Expression expression)
+        {
+            return "COUNT(*)";
+        }
+    }
+}

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

@@ -22,7 +22,7 @@ namespace SqlSugar
             this.context = context;
             var currentExpression = expression;
             allMethods.Add(currentExpression);
-            if (context.IsSingle && oppsiteExpression != null)
+            if (context.IsSingle && oppsiteExpression != null&& oppsiteExpression is MemberExpression)
             {
                 var childExpression = (oppsiteExpression as MemberExpression).Expression;
                 this.context.SingleTableNameSubqueryShortName = (childExpression as ParameterExpression).Name;

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

@@ -19,7 +19,8 @@ namespace SqlSugar
                                                     new SubAny(){ Context=Context },
                                                     new SubNotAny(){ Context=Context },
                                                     new SubBegin(){ Context=Context },
-                                                    new SubFromTable(){ Context=Context }
+                                                    new SubFromTable(){ Context=Context },
+                                                    new SubCount(){ Context=Context }
                                                 };
         }
 

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

@@ -36,9 +36,9 @@ namespace SqlSugar
             return default(bool);
         }
 
-        public bool Count()
+        public int Count()
         {
-            return default(bool);
+            return default(int);
         }
     }
 }

Src/Asp.Net/SqlSugar/SqlSugar.csproj

@@ -72,8 +72,9 @@
     <Compile Include="Abstract\InsertableProvider\InsertableProvider.cs" />
     <Compile Include="Abstract\DeleteProvider\DeleteableProvider.cs" />
     <Compile Include="Enum\DbType.cs" />
-    <Compile Include="ExpressionsToSql\Subquery\Items\ISubAction.cs" />
+    <Compile Include="ExpressionsToSql\Subquery\Items\ISubOperation.cs" />
     <Compile Include="ExpressionsToSql\Subquery\Items\SubAnd.cs" />
+    <Compile Include="ExpressionsToSql\Subquery\Items\SubCount.cs" />
     <Compile Include="ExpressionsToSql\Subquery\Items\SubLeftBracket.cs" />
     <Compile Include="ExpressionsToSql\Subquery\Items\SubFromTable.cs" />
     <Compile Include="ExpressionsToSql\Subquery\Items\SubAny.cs" />