JSON是一种轻量级的数据交换格式。它基于 ECMAScript的一个子集,采用完全独立于编程语言的文本格式来存储和表示数据。简洁和清晰的层次结构使得 JSON 成为理想的数据交换语言。 易于人阅读和编写,同时也易于机器解析和生成,并有效地提升网络传输效率。
首先在项目中引用第三方库:Newtonsoft.Json
编写模型类,定义Json结构
//模型类,定义Json结构
public class BaseModel
{
public List<ModelData> list_groupA { get; set; } = new List<ModelData>();
public List<ModelData> list_groupB { get; set; } = new List<ModelData>();
public List<ModelData> list_groupC { get; set; } = new List<ModelData>();
}
public class ModelData
{
public ModelData(int iD, int pointX, int pointY, string groupName)
{
ID = iD;
PointX = pointX;
PointY = pointY;
GroupName = groupName;
}
public int ID { get; set; }
public int PointX { get; set; }
public int PointY { get; set; }
public string GroupName { get; set; }
}
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序列化Json字符串,并保存文件
public void SaveToFile(string filePath)
{
if (filePath != "")
{
List<ModelData> list = new List<ModelData>(100);
for (int i = 1; i <= 100; i++)
{
if (i < 50)
{
list.Add(new ModelData(i, 10, 10, "集合A"));
}
else if (i >= 50 && i < 75)
{
list.Add(new ModelData(i, 20, 20, "集合B"));
}
else
{
list.Add(new ModelData(i, 30, 30, "集合C"));
}
}
BaseModel model = new BaseModel();
model.list_groupA = list.Where(x => x.GroupName == "集合A").ToList();
model.list_groupB = list.Where(x => x.GroupName == "集合B").ToList();
model.list_groupC = list.Where(x => x.GroupName == "集合C").ToList();
string json2 = JsonConvert.SerializeObject(model);
WriteJsonFile(filePath, json2);
}
}
/// <summary>
/// 将序列化的json字符串内容写入Json文件,并且保存
/// </summary>
/// <param name="path">路径</param>
/// <param name="jsonConents">Json内容</param>
public void WriteJsonFile(string path, string jsonConents)
{
try
{
File.WriteAllText(path, jsonConents, System.Text.Encoding.UTF8);
MessageBox.Show("保存成功!");
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
}
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如果不需要分组可将序列化对象改为list,即:
string json2 = JsonConvert.SerializeObject(list);
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读取文本字符串反序列化,获取指定字段值
public void ReadJsonFile(string readFilePath)
{
if (File.Exists(readFilePath))
{
//获取文件内容
string readString = File.ReadAllText(readFilePath);
//反序列化:单组
/*JArray ja = (JArray)JsonConvert.DeserializeObject(readString);
int jaCount = ja.Count;
ja[0]["PinHight"].ToString();*/
//反序列化
JObject jo = JsonConvert.DeserializeObject<JObject>(readString);
int joCount = jo.Count;
//获取指定位置值
int str = jo["list_groupA"][0].Value<int>("ID");
}
}
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读取Json文件,更新字段
/// <summary>
/// 更新字段
/// </summary>
/// <param name="fileName"></param>
public void UpdateJsonFile(string fileName)
{
string jsonString = File.ReadAllText(fileName, System.Text.Encoding.UTF8);//读取文件
JObject jobject = JObject.Parse(jsonString);//解析成json
jobject["list_student"][0]["ID"] = 111;//替换需要的文件
string convertString = Convert.ToString(jobject);//将json装换为string
File.WriteAllText(fileName, convertString, System.Text.Encoding.UTF8);//将内容写进jon文件中
}
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