JSON文件作为数据库

我试图使用JSON文件作为ASP.net(图像库)中静态内容的数据库。一切都很好:我可以读取文件和检索数据，并以一种简单的方式显示它们。我目前正在使用JSON.net和c#服务器端。

这是我的JSON(手工制作)的一部分:

{
    "Category 1": [
        {
            "TitleFile": "Title of IMG1",
            "FileName": "IMG1",
            "URLThumbFile": "Content/images/Gallery/IMG1_tb.png",
            "URLFile": "Content/images/Gallery/IMG1.png",
            "DescFile": "DESC IMG1"
        },
        {
            "TitleFile": "Title of IMG2",
            "FileName": "IMG2",
            "URLThumbFile": "Content/images/Gallery/IMG2_tb.png",
            "URLFile": "Content/images/Gallery/IMG2.png",
            "DescFile": "DESC IMG2"
        }
    ],
    "Category 2": [
        {
            "TitleFile": "Title of IMG3",
            "FileName": "IMG3",
            "URLThumbFile": "Content/images/Gallery/IMG3_tb.png",
            "URLFile": "Content/images/Gallery/IMG3.png",
            "DescFile": "DESC IMG3"
        },
        {
            "TitleFile": "Title of IMG4",
            "FileName": "IMG4",
            "URLThumbFile": "Content/images/Gallery/IMG4_tb.png",
            "URLFile": "Content/images/Gallery/IMG4.png",
            "DescFile": "DESC IMG4"
        }
    ],
    "Category 3": [
        {
            "TitleFile": "Title of IMG5",
            "FileName": "IMG5",
            "URLThumbFile": "Content/images/Gallery/IMG5_tb.png",
            "URLFile": "Content/images/Gallery/IMG5.png",
            "DescFile": "DESC IMG5"
        }
    ]
}

现在，我正在考虑如何创建一种"上传表单"，以便编写这个JSON文件并存储信息。客户端，一切正常:

<asp:TextBox runat="server" ID="txtFileName" />
<asp:TextBox runat="server" ID="txtFileTitle" />
<asp:TextBox runat="server" ID="txtFileDesc" />
<asp:FileUpload runat="server" ID="UPLFileImg" />
<asp:DropDownList runat="server" ID="ddlCategory"/>
<asp:Button runat="server" ID="btnUploadFile" Text="Upload" OnClick="btnUploadFile_Click" />

c#:

//Classes
public class JSONGalleryCategory //is it correct??
{
    public List<JSONGalleryContent> Category { get; set; }
}
public class JSONGalleryContent //??
{
    public string FileTitle { get; set; }
    public string FileName { get; set; }
    public string URLThumbFile { get; set; }
    public string URLFile { get; set; }
    public string DescFile { get; set; }
    public DateTime DataFile { get; set; }
}
//in the .aspx.cs
private void PopulateDDL()
{
    List<string> items = new List<string>();
    dynamic jsonFile = JObject.Parse(Utilities.ReadFile("~/Content/images/Gallery/Gallery.json"));
    foreach (JProperty category in jsonFile)
    {
        items.Add(category.Name);
    }
    ddlCategory.DataSource = items;
    ddlCategory.DataBind();
}
protected void btnUploadFile_Click(object sender, EventArgs e)
{           
    if (UPLFileImg.HasFile)
    {
        string fileName = Path.Combine(Server.MapPath("~/Content/images/Gallery/"), UPLFileImg.FileName);
        UPLFileImg.SaveAs(fileName);
        //Open Jsonfile...read content...deserialize?
        dynamic jsonFile = JObject.Parse(Utilities.ReadFile("~/Content/images/Gallery/Gallery.json"));
        //Create new node?
        //???
        //append new node?
        //serialize again and save...? ordering nodes??
        Utilities.WriteFile("~/Content/images/Gallery/Gallery.json", JsonConvert.SerializeObject("???", Formatting.Indented));
        Utilities.ShowMessage("Success");
    }
    else
    {
        Utilities.ShowMessage("Error");
    }
}

如何获取?

提前感谢!

 dynamic jsonFile = JObject.Parse(Utilities.ReadFile("~/Content/images/Gallery/Gallery.json"));
using (FileStream fs = File.Open(@"~/Content/images/Gallery/Gallery.json", FileMode.Open)) //may have to server.mappath this
using (StreamWriter sw = new StreamWriter(fs))
using (JsonWriter jw = new JsonTextWriter(sw))
{
    jw.Formatting = Formatting.Indented;
    JsonSerializer serializer = new JsonSerializer();
    serializer.Serialize(jw, jsonFile);
}