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示例：设置和检索实体图像

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发布日期： 2017年1月

适用于： Dynamics 365 (online),Dynamics 365 (on-premises),Dynamics CRM 2016,Dynamics CRM Online

此示例代码适用于 Microsoft Dynamics 365（在线或本地）。下载 Microsoft Dynamics CRM SDK 包。 它可能位于下载包的以下位置：

SampleCode\CS\GeneralProgramming\LateBound\EntityImages.cs

要求

有关运行此 SDK 中提供的示例代码的要求的详细信息，请参阅使用示例和帮助程序代码。

演示

此示例显示如何设置和检索实体图像数据。

示例执行以下任务：

  1. 使用 CreateImageAttributeDemoEntity 方法：

    1. 创建架构名称为 sample_ImageAttributeDemo 的自定义实体和架构名称为 sample_Name 的主要属性。

    2. 创建架构名称为 EntityImage 的图像属性。 所有图像属性均使用此名称。

    3. 检索和更新 sample_ImageAttributeDemo 实体的主窗体，将 <form> (FormXml)showImage 属性设置为 true，以使图像能够显示在窗体中。

    4. 发布 sample_ImageAttributeDemo 实体。

  2. 使用位于 Images 文件夹中（如图所示）的五个大小不同的图像为 sample_ImageAttributeDemo 实体创建五个新纪录。

    源图像的相对大小

    sample_Name 主属性字段值是字段的名称。

    在创建每条纪录后，您将有机会使用 ShowEntityFormInBrowser 方法在 Web 浏览器应用程序中查看该记录，因此您将可以看到如何根据窗体中可用的空间来重新调整源图像的大小。

    
//Use a 144x144 pixel image
Entity imageEntity1 = new Entity(_customEntityName.ToLower());
imageEntity1["sample_name"] = "144x144.png";
imageEntity1["entityimage"] = File.ReadAllBytes("Images\\144x144.png");
Guid imageEntity1Id = _serviceProxy.Create(imageEntity1);
ShowEntityFormInBrowser(promptforDelete, "144x144.png", imageEntity1Id);

//Use a 144x400 pixel image
Entity imageEntity2 = new Entity(_customEntityName.ToLower());
imageEntity2["sample_name"] = "144x400.png";
imageEntity2["entityimage"] = File.ReadAllBytes("Images\\144x400.png");
Guid imageEntity2Id = _serviceProxy.Create(imageEntity2);     
ShowEntityFormInBrowser(promptforDelete, "144x400.png", imageEntity2Id);

//Use a 400x144 pixel image
Entity imageEntity3 = new Entity(_customEntityName.ToLower());
imageEntity3["sample_name"] = "400x144.png";
imageEntity3["entityimage"] = File.ReadAllBytes("Images\\400x144.png");
Guid imageEntity3Id = _serviceProxy.Create(imageEntity3);
ShowEntityFormInBrowser(promptforDelete, "400x144.png", imageEntity3Id);

//Use a 400x500 pixel image
Entity imageEntity4 = new Entity(_customEntityName.ToLower());
imageEntity4["sample_name"] = "400x500.png";
imageEntity4["entityimage"] = File.ReadAllBytes("Images\\400x500.png");
Guid imageEntity4Id = _serviceProxy.Create(imageEntity4);
ShowEntityFormInBrowser(promptforDelete, "400x500.png", imageEntity4Id);

//Use a 60x80 pixel image
Entity imageEntity5 = new Entity(_customEntityName.ToLower());
imageEntity5["sample_name"] = "60x80.png";
imageEntity5["entityimage"] = File.ReadAllBytes("Images\\60x80.png");
Guid imageEntity5Id = _serviceProxy.Create(imageEntity5);
ShowEntityFormInBrowser(promptforDelete, "60x80.png", imageEntity5Id);

    备注

    此代码使用后期绑定实体，因为实体是在示例中创建的，不可作为强类型的类。 但是，在生成早期绑定类后，可以使用强类型的类。详细信息：使用代码生成工具 (CrmSvcUtil.exe) 创建早期绑定实体类

  3. 检索带有 entityimage 属性的记录，并保存重新调整大小后的文件。 运行示例后，您可以查找保存在 \bin\Debug 文件夹中的文件。

    
     //Retrieve and download the binary images
     string binaryImageQuery =
String.Format(@"<fetch mapping='logical'>
  <entity name='{0}'>
    <attribute name='sample_name' />
    <attribute name='entityimage' />
  </entity>
</fetch>",_customEntityName.ToLower());

     EntityCollection binaryImageResults = _serviceProxy.RetrieveMultiple(new FetchExpression(binaryImageQuery));


     Console.WriteLine("Records retrieved and image files saved to: {0}", Directory.GetCurrentDirectory());
     foreach (Entity record in binaryImageResults.Entities)
     {
      String recordName = record["sample_name"] as String;
      String downloadedFileName = String.Format("Downloaded_{0}", recordName);
      byte[] imageBytes = record["entityimage"] as byte[];
      var fs = new BinaryWriter(new FileStream(downloadedFileName, FileMode.Append, FileAccess.Write));
      fs.Write(imageBytes);
      fs.Close();
      Console.WriteLine(downloadedFileName);
     }

    已调整图像文件的大小，如图所示。

    下载的图像的相对大小

  4. 检索带有 entityimage_url 属性的记录，并显示您可以包括在应用程序中用于访问图像的相关 URL 值。 此查询的响应速度将更快，因为传输数据的数量变少了。

    
     //Retrieve and the records with just the url
     string imageUrlQuery =
String.Format(@"<fetch mapping='logical'>
  <entity name='{0}'>
    <attribute name='sample_name' />
    <attribute name='entityimage_url' />
  </entity>
</fetch>", _customEntityName.ToLower());

     EntityCollection imageUrlResults = _serviceProxy.RetrieveMultiple(new FetchExpression(imageUrlQuery));


     Console.WriteLine("These are the relative URLs for the images retrieved:");
     foreach (Entity record in imageUrlResults.Entities)
     {
      String imageUrl = record["entityimage_url"] as String;
      Console.WriteLine(imageUrl);
     }

    相关 URL 将类似于如下示例：

    • /Image/download.aspx?Entity=sample_imageattributedemo&Attribute=entityimage&Id=2ed5a666-7b51-e311-9088-00155d9c5607&Timestamp=635205044273046819

    • /Image/download.aspx?Entity=sample_imageattributedemo&Attribute=entityimage&Id=22f17c6d-7b51-e311-9088-00155d9c5607&Timestamp=635205044320978850

    • /Image/download.aspx?Entity=sample_imageattributedemo&Attribute=entityimage&Id=24f17c6d-7b51-e311-9088-00155d9c5607&Timestamp=635205044333049824

    • /Image/download.aspx?Entity=sample_imageattributedemo&Attribute=entityimage&Id=26f17c6d-7b51-e311-9088-00155d9c5607&Timestamp=635205044343080227

    • /Image/download.aspx?Entity=sample_imageattributedemo&Attribute=entityimage&Id=28f17c6d-7b51-e311-9088-00155d9c5607&Timestamp=635205044353421800

DeleteImageAttributeDemoEntity 方法使您可以删除 sample_ImageAttributeDemo 实体并将组织返回到运行示例之前的状态。 您不能重新运行示例，直到删除此实体。

示例

下面是示例的完整代码。


using System;
using System.ServiceModel;
using System.ServiceModel.Description;
using System.Diagnostics;
using System.Xml.Linq;
using System.IO;

// These namespaces are found in the Microsoft.Xrm.Sdk.dll assembly
// located in the SDK\bin folder of the SDK download.
using Microsoft.Xrm.Sdk;
using Microsoft.Xrm.Sdk.Query;
using Microsoft.Xrm.Sdk.Client;
using Microsoft.Xrm.Sdk.Discovery;
using Microsoft.Xrm.Sdk.Messages;
using Microsoft.Xrm.Sdk.Metadata;

// This namespace is found in Microsoft.Crm.Sdk.Proxy.dll assembly
// found in the SDK\bin folder.
using Microsoft.Crm.Sdk.Messages;

namespace Microsoft.Crm.Sdk.Samples
{
 /// <summary>
 /// Demonstrates how to do create and retrieve records with image data
 /// </summary>
 /// <remarks>
 /// At run-time, you will be given the option to delete all the
 /// database records created by this program.</remarks>
 public class EntityImages
 {
  #region Class Level Members
  private OrganizationServiceProxy _serviceProxy;
  private const String _customEntityName = "sample_ImageAttributeDemo";
  #endregion Class Level Members

  #region How To Sample Code
  /// <summary>
  /// This method first connects to the Organization service. Afterwards,
  /// a custom entity is created and configured to support entity images.
  /// Then records are created using this custom entity with image data. 
  /// The records are then retrieved and the resized images are saved.
  /// Finally, the custom entity can be deleted.
  /// </summary>
  /// <param name="serverConfig">Contains server connection information.</param>
  /// <param name="promptforDelete">When True, the user will be prompted to delete all
  /// created entities.</param>
  public void Run(ServerConnection.Configuration serverConfig, bool promptforDelete)
  {
   try
   {
    // Connect to the Organization service. 
    // The using statement assures that the service proxy will be properly disposed.
    using (_serviceProxy = ServerConnection.GetOrganizationProxy(serverConfig))
    {
     // This statement is required to enable early-bound type support.
     _serviceProxy.EnableProxyTypes();

     Console.WriteLine("Please wait while the custom Image Attribute Demo entity used by this sample is created.");
     //Creates the Image Attribute Demo entity used in this sample
     CreateImageAttributeDemoEntity();

     //Create 5 records using different sized images.
     /*

      This sample uses late-binding because the entity was just created and is
      not included in the 'MyOrganizationsCrmSdkTypes.cs' file created by the 
      code generation tool (CrmSvcUtil.exe)

     */
     //Use a 144x144 pixel image
     Entity imageEntity1 = new Entity(_customEntityName.ToLower());
     imageEntity1["sample_name"] = "144x144.png";
     imageEntity1["entityimage"] = File.ReadAllBytes("Images\\144x144.png");
     Guid imageEntity1Id = _serviceProxy.Create(imageEntity1);
     ShowEntityFormInBrowser(promptforDelete, "144x144.png", imageEntity1Id);

     //Use a 144x400 pixel image
     Entity imageEntity2 = new Entity(_customEntityName.ToLower());
     imageEntity2["sample_name"] = "144x400.png";
     imageEntity2["entityimage"] = File.ReadAllBytes("Images\\144x400.png");
     Guid imageEntity2Id = _serviceProxy.Create(imageEntity2);     
     ShowEntityFormInBrowser(promptforDelete, "144x400.png", imageEntity2Id);

     //Use a 400x144 pixel image
     Entity imageEntity3 = new Entity(_customEntityName.ToLower());
     imageEntity3["sample_name"] = "400x144.png";
     imageEntity3["entityimage"] = File.ReadAllBytes("Images\\400x144.png");
     Guid imageEntity3Id = _serviceProxy.Create(imageEntity3);
     ShowEntityFormInBrowser(promptforDelete, "400x144.png", imageEntity3Id);

     //Use a 400x500 pixel image
     Entity imageEntity4 = new Entity(_customEntityName.ToLower());
     imageEntity4["sample_name"] = "400x500.png";
     imageEntity4["entityimage"] = File.ReadAllBytes("Images\\400x500.png");
     Guid imageEntity4Id = _serviceProxy.Create(imageEntity4);
     ShowEntityFormInBrowser(promptforDelete, "400x500.png", imageEntity4Id);

     //Use a 60x80 pixel image
     Entity imageEntity5 = new Entity(_customEntityName.ToLower());
     imageEntity5["sample_name"] = "60x80.png";
     imageEntity5["entityimage"] = File.ReadAllBytes("Images\\60x80.png");
     Guid imageEntity5Id = _serviceProxy.Create(imageEntity5);
     ShowEntityFormInBrowser(promptforDelete, "60x80.png", imageEntity5Id);
     Console.WriteLine();
     //Retrieve and download the binary images
     string binaryImageQuery =
String.Format(@"<fetch mapping='logical'>
  <entity name='{0}'>
    <attribute name='sample_name' />
    <attribute name='entityimage' />
  </entity>
</fetch>",_customEntityName.ToLower());

     EntityCollection binaryImageResults = _serviceProxy.RetrieveMultiple(new FetchExpression(binaryImageQuery));


     Console.WriteLine("Records retrieved and image files saved to: {0}", Directory.GetCurrentDirectory());
     foreach (Entity record in binaryImageResults.Entities)
     {
      String recordName = record["sample_name"] as String;
      String downloadedFileName = String.Format("Downloaded_{0}", recordName);
      byte[] imageBytes = record["entityimage"] as byte[];
      var fs = new BinaryWriter(new FileStream(downloadedFileName, FileMode.Append, FileAccess.Write));
      fs.Write(imageBytes);
      fs.Close();
      Console.WriteLine(downloadedFileName);
     }
     Console.WriteLine();
     //Retrieve and the records with just the url
     string imageUrlQuery =
String.Format(@"<fetch mapping='logical'>
  <entity name='{0}'>
    <attribute name='sample_name' />
    <attribute name='entityimage_url' />
  </entity>
</fetch>", _customEntityName.ToLower());

     EntityCollection imageUrlResults = _serviceProxy.RetrieveMultiple(new FetchExpression(imageUrlQuery));


     Console.WriteLine("These are the relative URLs for the images retrieved:");
     foreach (Entity record in imageUrlResults.Entities)
     {
      String imageUrl = record["entityimage_url"] as String;
      Console.WriteLine(imageUrl);
     }


     DeleteImageAttributeDemoEntity(promptforDelete);
    }
   }

   // Catch any service fault exceptions that Microsoft Dynamics CRM throws.
   catch (FaultException<Microsoft.Xrm.Sdk.OrganizationServiceFault>)
   {
    // You can handle an exception here or pass it back to the calling method.
    throw;
   }
  }

  /// <summary>
  /// Creates any entity records that this sample requires.
  /// </summary>
  public void CreateImageAttributeDemoEntity()
  {
   //Create a Custom entity
   CreateEntityRequest createrequest = new CreateEntityRequest
   {

    //Define the entity
    Entity = new EntityMetadata
    {
     SchemaName = _customEntityName,
     DisplayName = new Label("Image Attribute Demo", 1033),
     DisplayCollectionName = new Label("Image Attribute Demos", 1033),
     Description = new Label("An entity created by an SDK sample to demonstrate how to upload and retrieve entity images.", 1033),
     OwnershipType = OwnershipTypes.UserOwned,
     IsActivity = false,

    },

    // Define the primary attribute for the entity
    PrimaryAttribute = new StringAttributeMetadata
    {
     SchemaName = "sample_Name",
     RequiredLevel = new AttributeRequiredLevelManagedProperty(AttributeRequiredLevel.None),
     MaxLength = 100,
     FormatName = StringFormatName.Text,
     DisplayName = new Label("Name", 1033),
     Description = new Label("The primary attribute for the Image Attribute Demo entity.", 1033)
    }

   };
   _serviceProxy.Execute(createrequest);
   Console.WriteLine("The Image Attribute Demo entity has been created.");

   //Create an Image attribute for the custom entity
   // Only one Image attribute can be added to an entity that doesn't already have one.
   CreateAttributeRequest createEntityImageRequest = new CreateAttributeRequest
   {
    EntityName = _customEntityName.ToLower(),
    Attribute = new ImageAttributeMetadata
    {
     SchemaName = "EntityImage", //The name is always EntityImage
     //Required level must be AttributeRequiredLevel.None
     RequiredLevel = new AttributeRequiredLevelManagedProperty(AttributeRequiredLevel.None), 
     DisplayName = new Label("Image", 1033),
     Description = new Label("An image to show with this demonstration.", 1033)

    }
   };
   _serviceProxy.Execute(createEntityImageRequest);
   Console.WriteLine("The Image attribute has been created.");

   QueryExpression qe = new QueryExpression("systemform");
   qe.Criteria.AddCondition("type", ConditionOperator.Equal, 2); //main form
   qe.Criteria.AddCondition("objecttypecode", ConditionOperator.Equal, _customEntityName.ToLower()); 
   qe.ColumnSet.AddColumn("formxml");

   SystemForm ImageAttributeDemoMainForm = (SystemForm)_serviceProxy.RetrieveMultiple(qe).Entities[0];

   XDocument ImageAttributeDemoMainFormXml = XDocument.Parse(ImageAttributeDemoMainForm.FormXml);
   //Set the showImage attribute so the entity image will be displayed
   ImageAttributeDemoMainFormXml.Root.SetAttributeValue("showImage", true);

   //Updating the entity form definition
   ImageAttributeDemoMainForm.FormXml = ImageAttributeDemoMainFormXml.ToString();

   _serviceProxy.Update(ImageAttributeDemoMainForm);
   Console.WriteLine("The Image Attribute Demo main form has been updated to show images.");


   PublishXmlRequest pxReq1 = new PublishXmlRequest { ParameterXml = String.Format(@"
   <importexportxml>
    <entities>
     <entity>{0}</entity>
    </entities>
   </importexportxml>", _customEntityName.ToLower()) };
   _serviceProxy.Execute(pxReq1);

   Console.WriteLine("The Image Attribute Demo entity was published");
  }


  public void ShowEntityFormInBrowser(bool prompt, String name, Guid id)
  {
   if (prompt)
   {
    Console.WriteLine("\nDo you want to view record '{0}' form? (y/n)", name);
    String viewFormAnswer = Console.ReadLine();
    if (viewFormAnswer.StartsWith("y") || viewFormAnswer.StartsWith("Y"))
    {
     try
     {
      String webServiceURL = _serviceProxy.EndpointSwitch.PrimaryEndpoint.AbsoluteUri;
      String entityInDefaultSolutionUrl = webServiceURL.Replace("XRMServices/2011/Organization.svc",
       String.Format("main.aspx?etn={0}&amp;pagetype=entityrecord&amp;id=%7B{1}%7D", _customEntityName.ToLower(),id.ToString()));

      ProcessStartInfo browserProcess = new ProcessStartInfo("iexplore.exe");
      browserProcess.Arguments = entityInDefaultSolutionUrl;
      Process.Start(browserProcess);

     }
     catch (SystemException)
     {
      Console.WriteLine("\nThere was a problem opening Internet Explorer.");
     }
    }
   }
  }

  /// <summary>
  /// Deletes any entity records that were created for this sample.
  /// <param name="prompt">Indicates whether to prompt the user 
  /// to delete the records created in this sample.</param>
  /// </summary>
  public void DeleteImageAttributeDemoEntity(bool prompt)
  {
   bool deleteRecords = true;

   if (prompt)
   {
    Console.WriteLine("\nDo you want to delete the entity created for this sample? (y/n) [y]: ");
    String answer = Console.ReadLine();

    deleteRecords = (answer.StartsWith("y") || answer.StartsWith("Y") || answer == String.Empty);
   }

   if (deleteRecords)
   {
    DeleteEntityRequest der = new DeleteEntityRequest() { LogicalName = _customEntityName.ToLower() };
    _serviceProxy.Execute(der);
    Console.WriteLine("The Image Attribute Demo entity has been deleted.");
   }
  }

  #endregion How To Sample Code

  #region Main method

  /// <summary>
  /// Standard Main() method used by most SDK samples.
  /// </summary>
  /// <param name="args"></param>
  static public void Main(string[] args)
  {
   try
   {
    // Obtain the target organization's Web address and client logon 
    // credentials from the user.
    ServerConnection serverConnect = new ServerConnection();
    ServerConnection.Configuration config = serverConnect.GetServerConfiguration();

    EntityImages app = new EntityImages();
    app.Run(config, true);
   }


   catch (FaultException<Microsoft.Xrm.Sdk.OrganizationServiceFault> ex)
   {
    Console.WriteLine("The application terminated with an error.");
    Console.WriteLine("Timestamp: {0}", ex.Detail.Timestamp);
    Console.WriteLine("Code: {0}", ex.Detail.ErrorCode);
    Console.WriteLine("Message: {0}", ex.Detail.Message);
    Console.WriteLine("Inner Fault: {0}",
        null == ex.Detail.InnerFault ? "No Inner Fault" : "Has Inner Fault");
   }
   catch (System.TimeoutException ex)
   {
    Console.WriteLine("The application terminated with an error.");
    Console.WriteLine("Message: {0}", ex.Message);
    Console.WriteLine("Stack Trace: {0}", ex.StackTrace);
    Console.WriteLine("Inner Fault: {0}",
        null == ex.InnerException.Message ? "No Inner Fault" : ex.InnerException.Message);
   }
   catch (System.Exception ex)
   {
    Console.WriteLine("The application terminated with an error.");
    Console.WriteLine(ex.Message);

    // Display the details of the inner exception.
    if (ex.InnerException != null)
    {
     Console.WriteLine(ex.InnerException.Message);

     FaultException<Microsoft.Xrm.Sdk.OrganizationServiceFault> fe = ex.InnerException
         as FaultException<Microsoft.Xrm.Sdk.OrganizationServiceFault>;
     if (fe != null)
     {
      Console.WriteLine("Timestamp: {0}", fe.Detail.Timestamp);
      Console.WriteLine("Code: {0}", fe.Detail.ErrorCode);
      Console.WriteLine("Message: {0}", fe.Detail.Message);
      Console.WriteLine("Trace: {0}", fe.Detail.TraceText);
      Console.WriteLine("Inner Fault: {0}",
          null == fe.Detail.InnerFault ? "No Inner Fault" : "Has Inner Fault");
     }
    }
   }

   // Additional exceptions to catch: SecurityTokenValidationException, ExpiredSecurityTokenException,
   // SecurityAccessDeniedException, MessageSecurityException, and SecurityNegotiationException.

   finally
   {
    Console.WriteLine("Press <Enter> to exit.");
    Console.ReadLine();
   }
  }
  #endregion Main method
 }
}

另请参阅

图像属性
Microsoft Dynamics 365 中的实体属性简介
在 Microsoft Dynamics 365 中引入实体

Microsoft Dynamics 365

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