如何使用json从文本文件反序列化回dictionary<string，string>？
如何使用json从文本文件反序列化回dictionary<string，string>？
提问于 2022-10-06 00:09:14
我正在使用Newtonsoft.Json包。
在表格的顶部：
Dictionary<string, string> FileList = new Dictionary<string, string>();这是我每次添加到json文本文件时，首先将其序列化为鼠标向上事件中的文本文件的方式：
rectangleName = @"d:\Rectangles\rectangle" + saveRectanglesCounter + ".bmp";
FileList.Add($"{dr.Location}, {dr.Size}", rectangleName);
string json = JsonConvert.SerializeObject(
FileList,
Formatting.Indented // this for pretty print
);
using (StreamWriter sw = new StreamWriter(@"d:\rectangles.txt", true))
{
sw.Write(json);
sw.Close();
}然后在构造函数中
FileList = JsonConvert.DeserializeObject<Dictionary<string, string>>(@"d:\rectangles.txt");但我在这句话上错了：
Newtonsoft.Json.JsonReaderException：“解析值: d. Path”时遇到的意外字符，第0行，位置0。
我尝试过这样做，首先将文件内容读入string变量，然后反序列化string变量：
string g = File.ReadAllText(@"d:\rectangles.txt");
FileList = JsonConvert.DeserializeObject<Dictionary<string, string>>(g);但是现在出错了：
Newtonsoft.Json.JsonReaderException HResult=0x80131500 Message=Additional文本在读取完JSON内容后遇到：{。路径''，第3行，位置1. Source=Newtonsoft.Json
这是文件内容，不是g变量内容，而是文件：
"{X=79,Y=117}, {Width=278, Height=119}": "d:\\Rectangles\\rectangle1.bmp"
}{
"{X=79,Y=117}, {Width=278, Height=119}": "d:\\Rectangles\\rectangle1.bmp",
"{X=75,Y=101}, {Width=412, Height=195}": "d:\\Rectangles\\rectangle2.bmp"
}{
"{X=79,Y=117}, {Width=278, Height=119}": "d:\\Rectangles\\rectangle1.bmp",
"{X=75,Y=101}, {Width=412, Height=195}": "d:\\Rectangles\\rectangle2.bmp",
"{X=176,Y=256}, {Width=120, Height=122}": "d:\\Rectangles\\rectangle3.bmp"
}{
"{X=79,Y=117}, {Width=278, Height=119}": "d:\\Rectangles\\rectangle1.bmp",
"{X=75,Y=101}, {Width=412, Height=195}": "d:\\Rectangles\\rectangle2.bmp",
"{X=176,Y=256}, {Width=120, Height=122}": "d:\\Rectangles\\rectangle3.bmp",
"{X=202,Y=240}, {Width=24, Height=16}": "d:\\Rectangles\\rectangle4.bmp"
}{
"{X=79,Y=117}, {Width=278, Height=119}": "d:\\Rectangles\\rectangle1.bmp",
"{X=75,Y=101}, {Width=412, Height=195}": "d:\\Rectangles\\rectangle2.bmp",
"{X=176,Y=256}, {Width=120, Height=122}": "d:\\Rectangles\\rectangle3.bmp",
"{X=202,Y=240}, {Width=24, Height=16}": "d:\\Rectangles\\rectangle4.bmp",
"{X=190,Y=98}, {Width=78, Height=190}": "d:\\Rectangles\\rectangle5.bmp"
}{
"{X=79,Y=117}, {Width=278, Height=119}": "d:\\Rectangles\\rectangle1.bmp",
"{X=75,Y=101}, {Width=412, Height=195}": "d:\\Rectangles\\rectangle2.bmp",
"{X=176,Y=256}, {Width=120, Height=122}": "d:\\Rectangles\\rectangle3.bmp",
"{X=202,Y=240}, {Width=24, Height=16}": "d:\\Rectangles\\rectangle4.bmp",
"{X=190,Y=98}, {Width=78, Height=190}": "d:\\Rectangles\\rectangle5.bmp",
"{X=231,Y=86}, {Width=128, Height=174}": "d:\\Rectangles\\rectangle6.bmp"
}{
"{X=79,Y=117}, {Width=278, Height=119}": "d:\\Rectangles\\rectangle1.bmp",
"{X=75,Y=101}, {Width=412, Height=195}": "d:\\Rectangles\\rectangle2.bmp",
"{X=176,Y=256}, {Width=120, Height=122}": "d:\\Rectangles\\rectangle3.bmp",
"{X=202,Y=240}, {Width=24, Height=16}": "d:\\Rectangles\\rectangle4.bmp",
"{X=190,Y=98}, {Width=78, Height=190}": "d:\\Rectangles\\rectangle5.bmp",
"{X=231,Y=86}, {Width=128, Height=174}": "d:\\Rectangles\\rectangle6.bmp",
"{X=81,Y=94}, {Width=433, Height=293}": "d:\\Rectangles\\rectangle7.bmp"
}{
"{X=79,Y=117}, {Width=278, Height=119}": "d:\\Rectangles\\rectangle1.bmp",
"{X=75,Y=101}, {Width=412, Height=195}": "d:\\Rectangles\\rectangle2.bmp",
"{X=176,Y=256}, {Width=120, Height=122}": "d:\\Rectangles\\rectangle3.bmp",
"{X=202,Y=240}, {Width=24, Height=16}": "d:\\Rectangles\\rectangle4.bmp",
"{X=190,Y=98}, {Width=78, Height=190}": "d:\\Rectangles\\rectangle5.bmp",
"{X=231,Y=86}, {Width=128, Height=174}": "d:\\Rectangles\\rectangle6.bmp",
"{X=81,Y=94}, {Width=433, Height=293}": "d:\\Rectangles\\rectangle7.bmp",
"{X=147,Y=57}, {Width=114, Height=261}": "d:\\Rectangles\\rectangle8.bmp"
}回答 2
Stack Overflow用户
回答已采纳
发布于 2022-10-06 03:05:09
您的代码中有一个bug，每次向文件写入json时，都会将其附加到现有的json中。这会导致您没有有效的json，因为它没有根。要修复它，只需打开文件以进行覆盖，而不是附加
using (StreamWriter sw = new StreamWriter(@"d:\rectangles.txt", false))
{
sw.Write(json);
sw.Close();
}也许您必须从空文件开始，因为现有的文件是无效的。
Stack Overflow用户
发布于 2022-10-06 02:26:42
最后一位，
您需要创建一个类来存储类似于以下内容的数据：
internal class Rect
{
public Point Location { get; set; }
public Size Size { get; set; }
public string FileName { get; set; }
public Rect()
{
}
public Rect(Point location, Size size, string fileName)
{
Location = location;
Size = size;
FileName = fileName;
}
}创建一个列表变量并使用您的rectangles.txt文件中的值填充它
要将列表数据存储到json，请执行以下操作：
List<Rect> myRect; // I'll assume you have this populated with your data.
string jsonData = JsonConvert.SerializeObject(myRect, Formatting.Indented);
//Write the json data to a file
File.WriteAllText("Rectangles.json", jsonData);"Rectangles.json“的示例内容
[
{
"Location": "79, 117",
"Size": "278, 119",
"FileName": "d:\\Rectangles\\rectangle1.bmp"
},
{
"Location": "75, 101",
"Size": "412, 195",
"FileName": "d:\\Rectangles\\rectangle2.bmp"
},
{
"Location": "176, 256",
"Size": "120, 122",
"FileName": "d:\\Rectangles\\rectangle3.bmp"
},
{
"Location": "202, 240",
"Size": "24, 16",
"FileName": "d:\\Rectangles\\rectangle4.bmp"
},
{
"Location": "190, 98",
"Size": "78, 190",
"FileName": "d:\\Rectangles\\rectangle5.bmp"
},
{
"Location": "231, 86",
"Size": "128, 174",
"FileName": "d:\\Rectangles\\rectangle6.bmp"
},
{
"Location": "81, 94",
"Size": "433, 293",
"FileName": "d:\\Rectangles\\rectangle7.bmp"
},
{
"Location": "147, 57",
"Size": "114, 261",
"FileName": "d:\\Rectangles\\rectangle8.bmp"
}
]最后，要将json数据反序列化回对象，然后将json数据读入字符串变量并按如下方式反序列化它：
string jsonData = File.ReadAllText("Rectangles.json");
List<Rect> myRects = JsonConvert.DeserializeObject<List<Rect>>(jsonData);变量"myRects“现在应该是一个List对象，它包含从jsonData变量反序列化的所有数据。
我希望这能帮到你。
约翰
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/73967449
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