Question

我正在尝试将一个对象写入LiteDb并读回。我尝试了以下代码，但不知何故，LiteDbParamEntry对象的所有参数都返回为NULL或零。

public class LiteDbParamEntry
{
    [BsonId]
    public int Id
    {
        get { return (Index * 0x100) + SubIndex; }
    }

    public ushort Index;

    public ushort SubIndex;

    public string Text;
}

public class LiteDbParamValueStorage
{
    private const string _liteDbPath = "MyLiteData.db";

    public LiteDbParamValueStorage()
    {
        WriteEntry(123, 25);
        ReadEntry(123, 25);
    }

    public void WriteEntry(ushort index, ushort subIndex)
    {
        using (var db = new LiteDatabase(_liteDbPath))
        {
            var entry = new LiteDbParamEntry {Index = index, SubIndex = subIndex, Text = "SomeText"};

            var entries = db.GetCollection<LiteDbParamEntry>("LiteDbParamEntry");

            entries.Insert(entry);
        }
    }

    public void ReadEntry(ushort index, ushort subIndex)
    {
        using (var db = new LiteDatabase(_liteDbPath))
        {
            var collection = db.GetCollection<LiteDbParamEntry>("LiteDbParamEntry");
            var paramEntry = collection.FindById((index * 0x100) + subIndex);
            if (paramEntry != null)
                Console.WriteLine(paramEntry.Text);          //paramEntry.Text is returned as Null
            else
                return;
        }
    }
}

有人可以指出正确的方向吗？

Answer 1

最后，我发现您的代码出了什么问题...您忘记在字段声明的右侧添加{ get; set; }指令；）

在这里看看：

public class LiteDbParamEntry
{
    [BsonId]
    public int Id
    {
        get { return (Index * 0x100) + SubIndex; }
    }

    public ushort Index { get; set; } //getter/setter added

    public ushort SubIndex  { get; set; } //getter/setter added

    public string Text  { get; set; } //getter/setter added
}

祝你好运！

无法从LiteDb存储和检索数据

1 个答案: