C# .NET serialization datacontractserializer

使用 DataContractSerializer 反序列化时出错

发布于 2024-12-04 02:41:04 字数 538 浏览 0 评论 0原文

当我将对象反序列化回其原始类型时，我的对象始终为 null。

这是我的代码：

ProjectSetup obj = new ProjectSetup();

if (System.Web.HttpContext.Current.Session["ProjectSetup"] == null)
    setBookProjectSetup();

string toDeserialise = System.Web.HttpContext.Current.
    Session["ProjectSetup"].ToString();

DataContractSerializer dcs = new DataContractSerializer(typeof(ProjectSetup));
MemoryStream ms = new MemoryStream(Encoding.UTF8.GetBytes(toDeserialise));
obj = (ProjectSetup) dcs.ReadObject(ms, true);

return obj;

原文

When I am deserializing my object back to it's original type my object is always null.

Here is my code:

ProjectSetup obj = new ProjectSetup();

if (System.Web.HttpContext.Current.Session["ProjectSetup"] == null)
    setBookProjectSetup();

string toDeserialise = System.Web.HttpContext.Current.
    Session["ProjectSetup"].ToString();

DataContractSerializer dcs = new DataContractSerializer(typeof(ProjectSetup));
MemoryStream ms = new MemoryStream(Encoding.UTF8.GetBytes(toDeserialise));
obj = (ProjectSetup) dcs.ReadObject(ms, true);

return obj;

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南烟 2024-12-11 02:41:04

我假设对 setBookProjectSetup 的调用将 ProjectSetup 的实例放置在 HttpSessionState 中，其键为 ProjectSetup代码>.

这里的问题是这样开始的：

string toDeserialise = System.Web.HttpContext.Current.
    Session["ProjectSetup"].ToString();

您随后使用 toDeserialize 字符串的内容作为反序列化的源。

除非您重载了 ToString 返回 DataContractSerializer 将能够反序列化（这是极不可能的）您可能在 Object< 上使用 ToString 的实现/code>，它只会返回类型的名称。

然后，您尝试将该字符串反序列化到您的对象中，这是行不通的。

您需要做的是将对象正确序列化为字节数组/ MemoryStream，如下所示：

using (var ms = new MemoryStream())
{
    // Create the serializer.
    var dcs = new DataContractSerializer(typeof(ProjectSetup));

    // Serialize to the stream.
    dcs.WriteObject(ms, System.Web.HttpContext.Current.Session["ProjectSetup"]);

此时，MemoryStream 将填充一系列表示序列化对象的字节。然后，您可以使用相同的 MemoryStream 取回对象：

    // Reset the position of the stream so the read occurs in the right place.
    ms.Position = 0;

    // Read the object.
    var obj = (ProjectSetup) dcs.ReadObject(ms);
}

I'm going to assume that the call to setBookProjectSetup places an instance of ProjectSetup in the HttpSessionState with a key of ProjectSetup.

The issue here starts with this:

string toDeserialise = System.Web.HttpContext.Current.
    Session["ProjectSetup"].ToString();

You subsequently use the contents of the toDeserialize string as the source of the deserialization.

Unless you've overloaded ToString to return a byte stream that the DataContractSerializer would be able to deserialize (it's highly unlikely) chances are you are using the implementation of ToString on Object, which will just return the type's name.

Then, you are trying to deserialize that string into your object, which isn't going to work.

What you need to do is properly serialize your object into a byte array/MemoryStream, like so:

using (var ms = new MemoryStream())
{
    // Create the serializer.
    var dcs = new DataContractSerializer(typeof(ProjectSetup));

    // Serialize to the stream.
    dcs.WriteObject(ms, System.Web.HttpContext.Current.Session["ProjectSetup"]);

At this point, the MemoryStream will be populated with a series of bytes representing your serialized object. You can then get the object back using the same MemoryStream:

    // Reset the position of the stream so the read occurs in the right place.
    ms.Position = 0;

    // Read the object.
    var obj = (ProjectSetup) dcs.ReadObject(ms);
}

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