【发布时间】：2014-04-22 15:16:35
【问题描述】：
我有以下模型结构：
public class Step : ActivityElement
{
public Step()
{
this.Id = Guid.NewGuid();
this.Label = "Basic Step";
this.Type = "step";
}
public Guid Id { get; set; }
public string Label { get; set; }
public Input Input { get; set; }
}
public abstract class Input
{
public string Type { get; set; }
public object Value { get; set; }
}
public class GridInput : Input
{
public GridInput()
{
this.Type = "grid";
this.GridHeader = new GridHeader();
this.RowList = new List<GridRow>();
}
public GridHeader GridHeader { get; set; }
public List<GridRow> RowList { get; set; }
}
public class GridRow
{
public GridRow()
{
this.IsDeleted = false;
this.CellList = new List<GridCell>();
}
public List<GridCell> CellList { get; set; }
public bool IsDeleted { get; set; }
}
public class GridCell
{
public GridCell()
{
this.name = "not set yet";
this.Input = null;
}
public string name { get; set; }
public Input Input { get; set; }
}
这是我要反序列化的 JSON
{
"Id":"e833ceae-57e5-4c52-8d56-b047790cb7c7",
"Label":"Grid time!",
"Input":
{
"GridHeader":{"ColumnDefinitionList":[{"field":"column1","title":"Column 1"},{"field":"column2","title":"Column 2"},{"field":"column3","title":"Column 3"},{"field":"column4","title":"Column 4"}]},
"RowList":
[
{
"CellList":
[
{"name":"column1","Input":{"Type":"text","Value":"cell 1 row 1"}},
{"name":"column2","Input":{"Type":"text","Value":"cell 2 row 1"}},
{"name":"column3","Input":{"Type":"text","Value":"cell 3 row 1"}},
{"name":"column4","Input":{"Type":"text","Value":"cell 4 row 1"}}
],
"IsDeleted":false
},
{
"CellList":
[
{"name":"column1","Input":{"Type":"text","Value":"cell 1 row 2"}},
{"name":"column2","Input":{"Type":"text","Value":"cell 2 row 2"}},
{"name":"column3","Input":{"Type":"text","Value":"cell 3 row 2"}},
{"name":"column4","Input":{"Type":"text","Value":"cell 4 row 2"}}
],
"IsDeleted":false
}
],
"Type":"grid",
"Value":null
},
"DisplayPosition":2,
"Type":"step"
}
这是确保 GridInput 是作为输入创建的对象的自定义反序列化器：
public abstract class JsonCreationConverter<T> : JsonConverter
{
protected abstract T Create(Type objectType, JObject jObject);
public override bool CanConvert(Type objectType)
{
return typeof(T).IsAssignableFrom(objectType);
}
public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
{
// Load JObject from stream
JObject jObject = JObject.Load(reader);
// Create target object based on JObject
T target = Create(objectType, jObject);
// Populate the object properties
serializer.Populate(jObject.CreateReader(), target);
return target;
}
}
public class InputJsonConverter : JsonCreationConverter<Input>
{
protected override Input Create(Type objectType, JObject jObject)
{
var type = (string)jObject.Property("Type");
switch (type)
{
case "grid":
return new GridInput();
case "text":
return new TextInput();
case "dropdown":
return new DropdownInput();
case "checkbox":
return new CheckboxInput();
}
throw new ApplicationException(String.Format("The given type {0} is not supported!", type));
}
}
我已经实现了一些可以跳过 GridHeader（我不需要反序列化它，所以它只是在反序列化过程中创建一个空的 GridHeader），但 RowList 最终总是为空在 GridInput 反序列化之后。 我已经尝试了很多东西，但我的想法已经不多了......
TL:DR：GridInput 已创建，但 RowList 为空
【问题讨论】：
-
尝试json2csharp.com，复制您的 JSON，这将为您生成匹配的架构。将其与您当前的架构进行比较，看看是否有问题。
-
this.RowList = new List<GridRow>();看起来你正在制作一个空的RowList。 -
json实际上是从那些Model生成的，发送到视图，修改后发回。所有这些都使用 Json.Net
-
@Timothy，没有这个调用，Rowlist = null，所以问题仍然存在
-
@Zwik 你没有显示足够的代码。序列化和反序列化一些带有
List<T>成员的“普通的旧 C#”类在我这边工作得很好。