将扩展名为CSV的文件保存到外部存储器[Xamarin.Froms]

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

<key>UIFileSharingEnabled</key>
<true/>
<key>LSSupportsOpeningDocumentsInPlace</key>
<true/>

public interface IFileService
{
    void SaveFileToExternalStorage(string fileName, string fileContent);
}

[assembly: Dependency(typeof(FileService))]
namespace YourAppName.Droid
{
    public class FileService : IFileService
    {
        public void SaveFileToExternalStorage(string fileName, string fileContent)
        {
            string filePath = Path.Combine(Android.OS.Environment.ExternalStorageDirectory.AbsolutePath, fileName);
            File.WriteAllText(filePath, fileContent);
        }
    }
}

[assembly: Dependency(typeof(FileService))]
namespace YourAppName.iOS
{
    public class FileService : IFileService
    {
        public void SaveFileToExternalStorage(string fileName, string fileContent)
        {
            string documentsPath = Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments);
            string filePath = Path.Combine(documentsPath, fileName);
            File.WriteAllText(filePath, fileContent);
        }
    }
}

string fileName = "example.csv";
string fileContent = "CSV file content";

DependencyService.Get<IFileService>().SaveFileToExternalStorage(fileName, fileContent);