C# 如何使用EF执行带有输入和输出参数的存储过程？

我使用EF代码优先的方法，并使用迁移创建了存储过程，如下所示：

public override void Up()
    {
        Sql(@"CREATE TYPE IdsList AS TABLE   
                    ( 
                    Id Int
                    )
                    GO

                    Create Procedure getChildIds(
                    @IdsList dbo.IdsList ReadOnly
                    )
                    As
                    Begin
                    WITH RecursiveCTE AS
                    (
                        SELECT Id
                        FROM dbo.PhysicalObjects
                        WHERE ParentId in (Select * from @IdsList)
                        --Where Id=108
                        UNION ALL

                        SELECT t.Id
                        FROM dbo.PhysicalObjects t
                        INNER JOIN RecursiveCTE cte ON t.ParentId = cte.Id
                    )
                    SELECT * FROM RecursiveCTE
                    End");
    }

    public override void Down()
    {
        Sql(@"Drop Type IdsList
                Go
                Drop Procedure getChildIds");
    }

 var idsList = new SqlParameter {ParameterName = "idsList",  Value = new int[] { 1,2,3,4,5} };

 var idParams = new SqlParameter("idParams", SqlDbType.Structured)
            {
                Direction = System.Data.ParameterDirection.Output
            };

var results = dbContext.Database.SqlQuery<int>("getChildIds @idsList, @idParams out", idsList,idParams) ;

var idsResult = (List<int>)idParams.Value;

 public override void Up()
    {
        Sql(@"CREATE TYPE IdsList AS TABLE   
                    ( 
                    Id Int
                    )
                    GO

                    Create Procedure getChildIds(
                    @IdsList dbo.IdsList ReadOnly
                    )
                    As
                    Begin
                    WITH RecursiveCTE AS
                    (
                        SELECT Id
                        FROM dbo.PhysicalObjects
                        WHERE ParentId in (Select * from @IdsList)
                        UNION ALL

                        SELECT t.Id
                        FROM dbo.PhysicalObjects t
                        INNER JOIN RecursiveCTE cte ON t.ParentId = cte.Id
                    )
                    SELECT Id From RecursiveCTE
                    End");
    }

    public override void Down()
    {
        Sql(@" Drop Procedure getChildIds
               Go
               Drop Type IdsList
               ");
    }

现在，如果我转到sql server management studio并执行以下脚本：

Declare @Ids dbo.IdsList

Insert into @Ids
SELECT 1

Exec getChildIds @Ids

它将成功执行，但现在我尝试按如下方式执行该存储过程：

public override void Up()
    {
        Sql(@"CREATE TYPE IdsList AS TABLE   
                    ( 
                    Id Int
                    )
                    GO

                    Create Procedure getChildIds(
                    @IdsList dbo.IdsList ReadOnly
                    )
                    As
                    Begin
                    WITH RecursiveCTE AS
                    (
                        SELECT Id
                        FROM dbo.PhysicalObjects
                        WHERE ParentId in (Select * from @IdsList)
                        --Where Id=108
                        UNION ALL

                        SELECT t.Id
                        FROM dbo.PhysicalObjects t
                        INNER JOIN RecursiveCTE cte ON t.ParentId = cte.Id
                    )
                    SELECT * FROM RecursiveCTE
                    End");
    }

    public override void Down()
    {
        Sql(@"Drop Type IdsList
                Go
                Drop Procedure getChildIds");
    }

 var idsList = new SqlParameter {ParameterName = "idsList",  Value = new int[] { 1,2,3,4,5} };

 var idParams = new SqlParameter("idParams", SqlDbType.Structured)
            {
                Direction = System.Data.ParameterDirection.Output
            };

var results = dbContext.Database.SqlQuery<int>("getChildIds @idsList, @idParams out", idsList,idParams) ;

var idsResult = (List<int>)idParams.Value;

 public override void Up()
    {
        Sql(@"CREATE TYPE IdsList AS TABLE   
                    ( 
                    Id Int
                    )
                    GO

                    Create Procedure getChildIds(
                    @IdsList dbo.IdsList ReadOnly
                    )
                    As
                    Begin
                    WITH RecursiveCTE AS
                    (
                        SELECT Id
                        FROM dbo.PhysicalObjects
                        WHERE ParentId in (Select * from @IdsList)
                        UNION ALL

                        SELECT t.Id
                        FROM dbo.PhysicalObjects t
                        INNER JOIN RecursiveCTE cte ON t.ParentId = cte.Id
                    )
                    SELECT Id From RecursiveCTE
                    End");
    }

    public override void Down()
    {
        Sql(@" Drop Procedure getChildIds
               Go
               Drop Type IdsList
               ");
    }

var idsList=newsqlparameter{ParameterName=“idsList”，Value=newint[]{1,2,3,4,5}；
var idParams=新的SqlParameter（“idParams”，SqlDbType.Structured）
{
方向=System.Data.ParameterDirection.Output
};
var results=dbContext.Database.SqlQuery（“getChildIds@idsList，@idParams out”，idsList，idParams）；
var idsResult=（列表）idParams.Value；

它不返回任何内容

---

那么，如何使用Table类型的输入和输出参数执行存储过程呢？

您必须以不同的方式获取数据：

---

我用这种方法解决了这个问题

首先，我更新了存储过程以返回ID，如下所示：

public override void Up()
    {
        Sql(@"CREATE TYPE IdsList AS TABLE   
                    ( 
                    Id Int
                    )
                    GO

                    Create Procedure getChildIds(
                    @IdsList dbo.IdsList ReadOnly
                    )
                    As
                    Begin
                    WITH RecursiveCTE AS
                    (
                        SELECT Id
                        FROM dbo.PhysicalObjects
                        WHERE ParentId in (Select * from @IdsList)
                        --Where Id=108
                        UNION ALL

                        SELECT t.Id
                        FROM dbo.PhysicalObjects t
                        INNER JOIN RecursiveCTE cte ON t.ParentId = cte.Id
                    )
                    SELECT * FROM RecursiveCTE
                    End");
    }

    public override void Down()
    {
        Sql(@"Drop Type IdsList
                Go
                Drop Procedure getChildIds");
    }

 var idsList = new SqlParameter {ParameterName = "idsList",  Value = new int[] { 1,2,3,4,5} };

 var idParams = new SqlParameter("idParams", SqlDbType.Structured)
            {
                Direction = System.Data.ParameterDirection.Output
            };

var results = dbContext.Database.SqlQuery<int>("getChildIds @idsList, @idParams out", idsList,idParams) ;

var idsResult = (List<int>)idParams.Value;

 public override void Up()
    {
        Sql(@"CREATE TYPE IdsList AS TABLE   
                    ( 
                    Id Int
                    )
                    GO

                    Create Procedure getChildIds(
                    @IdsList dbo.IdsList ReadOnly
                    )
                    As
                    Begin
                    WITH RecursiveCTE AS
                    (
                        SELECT Id
                        FROM dbo.PhysicalObjects
                        WHERE ParentId in (Select * from @IdsList)
                        UNION ALL

                        SELECT t.Id
                        FROM dbo.PhysicalObjects t
                        INNER JOIN RecursiveCTE cte ON t.ParentId = cte.Id
                    )
                    SELECT Id From RecursiveCTE
                    End");
    }

    public override void Down()
    {
        Sql(@" Drop Procedure getChildIds
               Go
               Drop Type IdsList
               ");
    }

下面是我如何解决使用实体框架执行存储过程的问题：

 var dataTable = new DataTable();
 dataTable.TableName = "idsList";
 dataTable.Columns.Add("Id", typeof(int));
 dataTable.Rows.Add(1);
 dataTable.Rows.Add(2);

  SqlParameter idsList = new SqlParameter("idsList", SqlDbType.Structured);
  idsList.TypeName = dataTable.TableName;
  idsList.Value = dataTable;

  var results = dbContext.Database.SqlQuery<int>("exec getChildIds @idsList", idsList).ToList();

var dataTable=new dataTable（）；
dataTable.TableName=“idsList”；
dataTable.Columns.Add（“Id”，typeof（int））；
dataTable.Rows.Add（1）；
dataTable.Rows.Add（2）；
SqlParameter idsList=新的SqlParameter（“idsList”，SqlDbType.Structured）；
idsList.TypeName=dataTable.TableName；
idsList.Value=数据表；
var results=dbContext.Database.SqlQuery（“exec getChildIds@idsList”，idsList）.ToList（）；

---

我希望我的代码能帮助其他有同样问题的人

在SQL中使用用户过程/函数和内置函数的最佳解决方案是这个库-

它的实现非常简单。它还允许遵循代码优先的方法

在您的情况下，您需要使用表值函数

定义模型

[ComplexType]
public class IdModel
{
     public int Id { get; set; }
}

在DbContext中声明类型和约定

protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
    modelBuilder.Conventions.Add(new FunctionConvention<DbContext>());

    modelBuilder.ComplexType<IdModel>();

    base.OnModelCreating(modelBuilder);
}

[Function(FunctionType.TableValuedFunction, nameof(ufnGetChildIds), Schema = "dbo")]
public IQueryable<IdModel> ufnGetChildIds([Parameter(DbType = "IdModel", Name = "IdsList")]List<IdModel> IdsList)
{
    ObjectParameter IdsListParameter = new ObjectParameter("IdsList", IdsList);

    return this.ObjectContext().CreateQuery<IdModel>(
        $"[{nameof(this.ufnGetChildIds)}](@{nameof(IdsList)})", IdsListParameter);
}

[TestMethod]
public void CallTableValuedFunction()
{
    using (DbContext database = new DbContext())
    {
        IQueryable<IdModel> employees = database.ufnGetChildIds(new List<IdModel> { new IdModel { Id = 1 }});
    }
}

模型创建时受保护的覆盖无效（DbModelBuilder modelBuilder）
{
添加（新函数convention（））；
modelBuilder.ComplexType（）；
基于模型创建（modelBuilder）；
}

在DbContext中定义函数

protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
    modelBuilder.Conventions.Add(new FunctionConvention<DbContext>());

    modelBuilder.ComplexType<IdModel>();

    base.OnModelCreating(modelBuilder);
}

[Function(FunctionType.TableValuedFunction, nameof(ufnGetChildIds), Schema = "dbo")]
public IQueryable<IdModel> ufnGetChildIds([Parameter(DbType = "IdModel", Name = "IdsList")]List<IdModel> IdsList)
{
    ObjectParameter IdsListParameter = new ObjectParameter("IdsList", IdsList);

    return this.ObjectContext().CreateQuery<IdModel>(
        $"[{nameof(this.ufnGetChildIds)}](@{nameof(IdsList)})", IdsListParameter);
}

[TestMethod]
public void CallTableValuedFunction()
{
    using (DbContext database = new DbContext())
    {
        IQueryable<IdModel> employees = database.ufnGetChildIds(new List<IdModel> { new IdModel { Id = 1 }});
    }
}

[函数（FunctionType.TableValuedFunction，name of（ufngetchildis），Schema=“dbo”）]
公共IQueryable ufnGetChildIds（[参数（DbType=“IdModel”，Name=“IdsList”）]列表IdsList）
{
ObjectParameter IdsListParameter=新的ObjectParameter（“IdsList”，IdsList）；
返回此.ObjectContext（）.CreateQuery(
$“[{nameof（this.ufngetchildis）}]（@{nameof（IdsList）}）”，IdsListParameter）；
}

并从DbContext中使用它

protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
    modelBuilder.Conventions.Add(new FunctionConvention<DbContext>());

    modelBuilder.ComplexType<IdModel>();

    base.OnModelCreating(modelBuilder);
}

[Function(FunctionType.TableValuedFunction, nameof(ufnGetChildIds), Schema = "dbo")]
public IQueryable<IdModel> ufnGetChildIds([Parameter(DbType = "IdModel", Name = "IdsList")]List<IdModel> IdsList)
{
    ObjectParameter IdsListParameter = new ObjectParameter("IdsList", IdsList);

    return this.ObjectContext().CreateQuery<IdModel>(
        $"[{nameof(this.ufnGetChildIds)}](@{nameof(IdsList)})", IdsListParameter);
}

[TestMethod]
public void CallTableValuedFunction()
{
    using (DbContext database = new DbContext())
    {
        IQueryable<IdModel> employees = database.ufnGetChildIds(new List<IdModel> { new IdModel { Id = 1 }});
    }
}

[TestMethod]
public void CallTableValuedFunction（）
{
使用（DbContext数据库=新的DbContext（））
{
IQueryable employees=database.ufngetchildis（新列表{new-IdModel{Id=1}}）；
}
}

我在您的SP中没有看到

输出

参数；只有一个输入参数（

@IdsList

）。而您的SP正在返回一个数据集。我是否应该修改存储过程？是的，您需要声明一个输出变量。不过，我认为没有必要在此处使用

OUTPUT

参数。就我个人而言，我宁愿更改您的应用程序（C#）代码，以期望返回一个

DataTable

。您可以使用

输出

参数，但这似乎是不必要的复杂性，您可能会在应用程序中将其转换为

数据表

。老实说，我不太擅长编写C。我可以很好地阅读它，因此我可以看到这个问题，然而，我总是用VB.Net编写（要阅读，语言并没有太大的不同）。我还没有处于需要学习/使用C#的位置，因此我还没有学会如何编写C#。Igor，请不要只是发布一些工具或库作为答案。至少要在答案本身上加以证明。