[UWP]将json文件反序列化为UWP应用程序。 mscorlib.ni.dll中出现“System.IO.FileNotFoundException”类型的异常，但未在用户代码中处理 [英] [UWP]Deserialize json file into UWP app. An exception of type 'System.IO.FileNotFoundException' occurred in mscorlib.ni.dll but was not handled in user code
问题描述
嗨。
我正在尝试将json文件读入我的项目并将其添加到名为CountryCodes的列表中。
I am attempting to read a json file into my project and add it to a list called CountryCodes.
类ReadInFile
  {
      public async static Task deserializeJsonAsync（）
      {
          string content = String.Empty;
         列表与LT; CountryCodes> myCodes;
&NBSP; &NBSP; &NBSP; &NBSP; &NBSP; var jsonSerializer = new DataContractJsonSerializer（typeof（List< CountryCodes>））;
&NBSP; &NBSP; &NBSP; &NBSP; &NBSP; var myStream = await Windows.Storage.ApplicationData.Current.LocalFolder.OpenStreamForReadAsync（" Country-codes.txt"）;
&NBSP; &NBSP; &NBSP; &NBSP; &NBSP; myCodes =（List< CountryCodes>）jsonSerializer.ReadObject（myStream）;
&NBSP; &NBSP; &NBSP; &NBSP; &NBSP; foreach（my代码中的var代码）
&NBSP; &NBSP; &NBSP; &NBSP; &NBSP; {
&NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; content + = String.Format（" Name：{0}，Code：{1}"，code.name，code.code）;
&NBSP; &NBSP; &NBSP; &NBSP; &NBSP; }
&NBSP; &NBSP; &NBSP; }¥b $ b &NBSP; }
class ReadInFile
{
public async static Task deserializeJsonAsync()
{
string content = String.Empty;
List<CountryCodes> myCodes;
var jsonSerializer = new DataContractJsonSerializer(typeof(List<CountryCodes>));
var myStream = await Windows.Storage.ApplicationData.Current.LocalFolder.OpenStreamForReadAsync("Country-codes.txt");
myCodes = (List<CountryCodes>)jsonSerializer.ReadObject(myStream);
foreach(var code in myCodes)
{
content += String.Format("Name: {0}, Code: {1}", code.name, code.code);
}
}
}
公共类CountryCodes
&NBSP; {
&NBSP; &NBSP; &NBSP;公共字符串代码{get;组; }¥b $ b &NBSP; &NBSP; &NBSP;公共字符串名称{get;组; }¥b $ b &NBSP; }
public class CountryCodes
{
public string code { get; set; }
public string name { get; set; }
}
//在UI中按下时启动过程
//When pressed in the UI starts the process
private async void WeatherCityButton_Click（object sender，RoutedEventArgs e）
{
&NBSP; &NBSP; await ReadInFile.deserializeJsonAsync（）;
private async void WeatherCityButton_Click(object sender, RoutedEventArgs e)
{
await ReadInFile.deserializeJsonAsync();
}
mscorlib.ni.dll中出现'System.IO.FileNotFoundException'类型的异常但未在用户代码中处理。
运行我的代码时出现此错误。
An exception of type 'System.IO.FileNotFoundException' occurred in mscorlib.ni.dll but was not handled in user code. I get this error when i run my code.
其他信息：系统找不到指定的文件。
Additional information: The system cannot find the file specified.
任何帮助都会很棒。
推荐答案
您收到的错误消息应该是不言自明的。您得到此异常，因为没有名为"Country-codes.txt"的文件。在本地应用程序数据存储中的根文件夹中。此文件夹通常位于C：\ Users \yourname \ AppData \ Local @\\Packages \ 510c9cfa-b93a-4613-9f7c-b148ad4b3898_d9dzbydf825f0 \ LocalState的路径中。
The error message you are getting should be pretty self-explanatory. You get this exception because there is no file named "Country-codes.txt" in the root folder in the local app data store. This folder is typically located at a path like C:\Users\yourname\AppData\Local\Packages\510c9cfa-b93a-4613-9f7c-b148ad4b3898_d9dzbydf825f0\LocalState.
我想你没有在那里保存文件然后就找不到运行时了。有关LocalFolder的更多信息，请参阅以下页面：
https://msdn.microsoft.com / library / windows / apps / br241621
I guess you didn't save your file there and then it won't be found a runtime. Please refer to the following page for more information about the LocalFolder: https://msdn.microsoft.com/library/windows/apps/br241621
希望有所帮助。
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