C# 如何从linq返回数组？

您好，我正在编写linq查询以从多个表中获取数据。我试图得到如下所示的对象数组

   processobject retObj = new processobject();
 retObj =(from c in entityObject.NCT_Process
    join user in entityObject.NCT_UserRegistration on c.createdUserId equals user.User_Id
     join file in entityObject.NCT_FileUpload on c.iconfileId equals file.upld_ID 
    join templObj in entityObject.NCT_Templates on c.ID equals templObj.processId
   where c.processid == "10"
   select new processobject
    {
    id = c.ID,
    code = c.code,
    flochartContent = c.flowchartContent,
    //arrayofTemplates array i want to return
    }
    );
    public class processobject
    {
    public templatesObject[] arrayofTemplates { get; set; }
    public int id { get; set; }
    public string flochartContent { get; set; }
    public string code { get; set; }
    }

在上面的查询中，我编写了一个条件，其中

c.processid==“10”

。因此，

NCT_模板

中存在多条记录，且

processid

10。我想返回包含所有记录的数组。我在自定义类中创建了如下数组。 我有这个疑问

 processobject retObj = new processobject();
retObj = (from c in entityObject.NCT_Process
                                  join user in entityObject.NCT_UserRegistration on c.createdUserId equals user.User_Id
                                  join file in entityObject.NCT_FileUpload on c.iconfileId equals file.upld_ID
                                  into filesObjFirst
                                  from wt1 in filesObjFirst.DefaultIfEmpty()
                                  join templObj in entityObject.NCT_Templates on c.ID equals templObj.processId
                                  into filesObj
                                  from wt in filesObj.DefaultIfEmpty()
                                  where c.ID == dbObject.ID
                                  select new processobject
                                  {

                                      id = c.ID,
                                      code = c.code,
                                      flochartContent = c.flowchartContent,
                                      name = c.name,
                                      parentId = c.parentId,
                                      projectId = c.projectId,
                                      objectives = c.objectives,
                                      displayOrder = c.dispalyOrder,
                                      iconFileId = c.iconfileId,
                                      level = c.level,
                                      iconFileobj = new iconFile
                                      {
                                          id = wt1.upld_ID,
                                          name = wt1.fileName,
                                          url = wt1.filePath
                                      },
                                      description = c.description,
                                      startCriteria = c.startCriteria,
                                      endCriteria = c.endCriteria,
                                      reporting = c.reporting,
                                      output = c.output,
                                      kpi = c.kpi,
                                      procedureHistory = c.procedureHistory,
                                      role = c.role,
                                      duration = c.duration,
                                      owner = c.owner,
                                      visibility = true,
                                      createdUserId = c.createdUserId,
                                  }).FirstOrDefault();

我还有一个问题

 templatesObject[] templatesobject = (from c in entityObject.NCT_Templates
                                                             where c.processId == dbObject.ID
                                                             join file in entityObject.NCT_FileUpload on c.templateFileId equals file.upld_ID
                                                             into filesObjFirst
                                                             from wt1 in filesObjFirst.DefaultIfEmpty()
                                                             select new templatesObject
                                                             {
                                                                 id = c.id,
                                                                 title = c.title,
                                                                 version = c.version,
                                                                 visible = c.visibility,
                                                                 filesObj = new iconFileTemplate()
                                                                 {
                                                                     id = wt1.upld_ID,
                                                                     url = wt1.filePath,
                                                                     name = wt1.fileName
                                                                 }
                                                             }).ToArray();

在

arrayofTemplates

内部，我想存储

NCT_模板的记录

。 任何帮助都将不胜感激。谢谢。

A

。ToArray（）

将在您查询后完成此工作

   processobject retObj = new processobject();
 retObj =(from c in entityObject.NCT_Process
    join user in entityObject.NCT_UserRegistration on c.createdUserId equals user.User_Id
     join file in entityObject.NCT_FileUpload on c.iconfileId equals file.upld_ID 
    join templObj in entityObject.NCT_Templates on c.ID equals templObj.processId
   where c.processid == "10"
   select new processobject
    {
    id = c.ID,
    code = c.code,
    flochartContent = c.flowchartContent,
    //arrayofTemplates array i want to return
    }
    );

var arr = retObj.ToArray();

更新

我建议您使用

ICollection

而不是数组。由于需要阵列，解决方案如上所述，但如果使用

ICollection

，则更容易理解：

public class processobject
{
public ICollection<processobject> processobject{ get; set; }
public int id { get; set; }
public string flochartContent { get; set; }
public string code { get; set; }
}

更新

由于json对象中的数组返回属性，我建议您创建另一个模型。并将值直接传递给此类的对象。如下图所示：

public class processobject
{
public templateFileId templateFileId{ get; set; }
public int id { get; set; }
public string flochartContent { get; set; }
public string code { get; set; }
}

public class templateFileId
{
  public int id {get; set;}
  public string url {get; set;}
  public string name {get; set;}
  public int created {get; set;}
}

一个

.ToArray（）

将在您查询后执行此任务

   processobject retObj = new processobject();
 retObj =(from c in entityObject.NCT_Process
    join user in entityObject.NCT_UserRegistration on c.createdUserId equals user.User_Id
     join file in entityObject.NCT_FileUpload on c.iconfileId equals file.upld_ID 
    join templObj in entityObject.NCT_Templates on c.ID equals templObj.processId
   where c.processid == "10"
   select new processobject
    {
    id = c.ID,
    code = c.code,
    flochartContent = c.flowchartContent,
    //arrayofTemplates array i want to return
    }
    );

var arr = retObj.ToArray();

更新

我建议您使用

ICollection

而不是数组。由于需要阵列，解决方案如上所述，但如果使用

ICollection

，则更容易理解：

public class processobject
{
public ICollection<processobject> processobject{ get; set; }
public int id { get; set; }
public string flochartContent { get; set; }
public string code { get; set; }
}

更新

由于json对象中的数组返回属性，我建议您创建另一个模型。并将值直接传递给此类的对象。如下图所示：

public class processobject
{
public templateFileId templateFileId{ get; set; }
public int id { get; set; }
public string flochartContent { get; set; }
public string code { get; set; }
}

public class templateFileId
{
  public int id {get; set;}
  public string url {get; set;}
  public string name {get; set;}
  public int created {get; set;}
}

---

非常感谢。我编辑了我的问题。我不知道如何为属性赋值。我已经在上面发布了示例对象。@NiranjangDBole updated:），请记住，如果数组返回多组数据，您需要如上所述使用ICollection。谢谢您的时间。在我的示例中，templateFileId将有多行。如何为templateFileId的属性赋值。例如，我写了id=c.id，title=c.title，version=c.version，这样我怎么能给url，name赋值呢etc@NiranjanGodbole在您的查询中。您可以根据TemplatefileId进行选择，将数据分配给新类，如：

newTemplateFileId{id=c.id，url=c.url，name=c.name，created=c.created}

我已经选择了新的processobject如何添加新的TemplatefileId谢谢。我编辑了我的问题。我不知道如何为属性赋值。我已经在上面发布了示例对象。@NiranjangDBole updated:），请记住，如果数组返回多组数据，您需要如上所述使用ICollection。谢谢您的时间。在我的示例中，templateFileId将有多行。如何为templateFileId的属性赋值。例如，我写了id=c.id，title=c.title，version=c.version，这样我怎么能给url，name赋值呢etc@NiranjanGodbole在您的查询中。您可以基于TemplatefileId进行选择，将数据分配给新类，如：

newTemplateFileId{id=c.id，url=c.url，name=c.name，created=c.created}

我已经选择了新的processobject如何添加新的TemplatefileId