.net 和UserName=@UserName”，new{Datasource=pendingAttachment.Datasource，pendingAttachment.LastUpdated，pendingAttachment.PendingCount，pe

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和UserName=@UserName”，new{Datasource=pendingAttachment.Datasource，pendingAttachment.LastUpdated，pendingAttachment.PendingCount，pendingAttachment.DeviceId，UserName=pendingAttachment.UserName}）；我这样做了，所以在执行foreach（）时，您不会尝试使用已经声明的参数但是…这不是它所做的；它所做的是：从命令中删除所有参数，所以：零参数；还有-为什么它在没有执行循环中的某些内容的情况下循环附件？我清除了，这是一个新错误：+ex{“参数化查询”（@Datasource nvarchar（4000），@LastUpdated nvarchar（4000），@Pending'需要未提供的参数“@Datasource”。}System.Exception{System.Data.SqlClient.SqlException}

 public BaseResponse Post([FromBody]List<PendingAttachment> pendingAttachmentRequest)
    {
        PendingAttachment pendingAttachment = new PendingAttachment();
        List<SqlParameter> sqlParameters = new List<SqlParameter>() 
        {
            new SqlParameter("@Datasource", pendingAttachment.DataSource),
            new SqlParameter("@LastUpdated", pendingAttachment.LastUpdated),
            new SqlParameter("@PendingCount", pendingAttachment.PendingCount),
            new SqlParameter("@DeviceId", pendingAttachment.DeviceId),
            new SqlParameter("@Username", pendingAttachment.UserName),
        };
        try
        {           
            RequestHeaders headers = new RequestHeaders();
            var query = "SELECT count(*) FROM PendingAttachments WHERE DeviceId = @DeviceId AND UserName = @UserName";
            using (var onbaseConnection = MobileCompleteServer.Helpers.OnbaseAuth.Connect(headers))
            {
                var connectionString = System.Configuration.ConfigurationManager.AppSettings["ConnectionString"];

                using (SqlConnection sqlConnection = new SqlConnection(connectionString))
                {
                    sqlConnection.Open();
                    using (SqlCommand comm = new SqlCommand(query, sqlConnection))
                    {
                        comm.CommandType = System.Data.CommandType.Text;
                        foreach(PendingAttachment attachment in pendingAttachmentRequest)
                        {
                            
                            comm.Parameters.AddRange(sqlParameters.ToArray());
                            comm.Parameters.Clear();
                        }
                        int rowCount = (int)comm.ExecuteScalar();   //FAILS HERE
                        if (rowCount > 0)
                        {
                            using (SqlCommand sqlComm = new SqlCommand("sp_UpdatePendingAttachments", sqlConnection))
                            {
                                sqlComm.CommandType = System.Data.CommandType.StoredProcedure;
                                foreach (PendingAttachment attachment in pendingAttachmentRequest)
                                {
                                    
                                    sqlComm.Parameters.AddRange(sqlParameters.ToArray());
                                    sqlComm.Parameters.Clear();
                                }
                                sqlComm.ExecuteNonQuery();
                            }
                        }
                        else
                        {
                            using (SqlCommand sqlCommand = new SqlCommand("sp_InsertPendingAttachments", sqlConnection))
                            {
                                sqlCommand.CommandType = System.Data.CommandType.StoredProcedure;
                                foreach(PendingAttachment attachment in pendingAttachmentRequest)
                                {
                                    
                                    sqlCommand.Parameters.AddRange(sqlParameters.ToArray());
                                    sqlCommand.Parameters.Clear();
                                }
                                sqlCommand.ExecuteNonQuery();
                            }
                        }
                    }
                }
                return new BaseResponse();
            }
        }
        catch (Exception ex)
        {
                return new BaseResponse
                {
                    Exception = ErrorCodes.Get(ex, ErrorCodes.PendingAttachmentError),
                    ExceptionStackTrace = ex.ToString()
                };
            

        }
    }
}