Question

在分析breeze元数据文件的早期版本的breeze中，我会看到一种格式，显示描述DBContext的详细的元数据json格式。

Breeze的例子就是这样的一个例子：

{  
   "schema":{  
      "namespace":"Todo.Models",
      "alias":"Self",
      "annotation:UseStrongSpatialTypes":"false",
      "xmlns:annotation":"http://schemas.microsoft.com/ado/2009/02/edm/annotation",
      "xmlns":"http://schemas.microsoft.com/ado/2009/11/edm",
      "cSpaceOSpaceMapping":"[[\"Todo.Models.TodoItem\",\"Todo.Models.TodoItem\"]]",
      "entityType":{  
         "name":"TodoItem",
         "key":{  
            "propertyRef":{  
               "name":"Id"
            }
         },
         "property":[  
            {  
               "name":"Id",
               "type":"Edm.Int32",
               "nullable":"false",
               "annotation:StoreGeneratedPattern":"Identity"
            },
            {  
               "name":"Description",
               "type":"Edm.String",
               "maxLength":"30",
               "fixedLength":"false",
               "unicode":"true",
               "nullable":"false"
            },
            {  
               "name":"CreatedAt",
               "type":"Edm.DateTime",
               "nullable":"false"
            },
            {  
               "name":"IsDone",
               "type":"Edm.Boolean",
               "nullable":"false"
            },
            {  
               "name":"IsArchived",
               "type":"Edm.Boolean",
               "nullable":"false"
            }
         ]
      },
      "entityContainer":{  
         "name":"TodosContext",
         "entitySet":{  
            "name":"Todos",
            "entityType":"Self.TodoItem"
         }
      }
   }
}

但是现在在运行这个新版本的微风之后，点击我的元数据文件，我发现这个奇怪的怪异：

{  
   "?xml":{  
      "version":"1.0",
      "encoding":"utf-8"
   },
   "schema":{  
      "namespace":"DBModel",
      "alias":"Self",
      "annotation:UseStrongSpatialTypes":"false",
      "xmlns:annotation":"http://schemas.microsoft.com/ado/2009/02/edm/annotation",
      "xmlns:customannotation":"http://schemas.microsoft.com/ado/2013/11/edm/customannotation",
      "xmlns":"http://schemas.microsoft.com/ado/2009/11/edm",
      "cSpaceOSpaceMapping":"[[\"DBModel.User\",\"Model.User\"]]",
      "entityContainer":{  
         "name":"DBEntities",
         "annotation:LazyLoadingEnabled":"true",
         "entitySet":{  
            "name":"Users",
            "entityType":"DBModel.User"
         }
      },
      "entityType":{  
         "name":"User",
         "key":{  
            "propertyRef":{  
               "name":"Id"
            }
         },
         "property":[  
            {  
               "name":"Id",
               "type":"Edm.Int64",
               "nullable":"false",
               "annotation:StoreGeneratedPattern":"Identity"
            },
            {  
               "name":"Firstname",
               "type":"Edm.String",
               "maxLength":"40",
               "fixedLength":"false",
               "unicode":"false"
            },
            {  
               "name":"Lastname",
               "type":"Edm.String",
               "maxLength":"60",
               "fixedLength":"false",
               "unicode":"false"
            },
            {  
               "name":"Email",
               "type":"Edm.String",
               "nullable":"false",
               "maxLength":"128",
               "fixedLength":"false",
               "unicode":"false"
            }
         ]
      }
   }
}

在元数据中包含xml信息有什么意义？微风如何能够从这两个版本之间的元数据中获取信息并仍然可以正常工作？

Answer 1

EFContextProvider（在breeze.server.net中）基本上只是将EntityFramework中的元数据信息从XML转换为JSON，然后将其发送回Breeze客户端。 Breeze客户端知道如何从JSON格式获得它所需要的东西，即使有一些额外的XML相关位被添加。

基本上，Breeze忽略了不相关的部分。在较新版本的EF中，XML中的额外内容已经扩展，但基本结构保持不变。

Breeze元数据返回为xml数据解析为json

1 个答案: