我可以使用silverlight在客户端的PC上写一个文件

using System.IO;
using System.IO.IsolatedStorage;
using System.Windows.Media.Imaging;
using System.Windows.Media.Media3D;
using Microsoft.Silverlight.Testing;
using Microsoft.VisualStudio.TestTools.UnitTesting;

[TestClass]
public class SilverlightTests
{
    [TestMethod]
    public void TestWriteFileToIsolatedStorage()
    {
        // Arrange
        var fileName = "test.txt";
        var fileContent = "This is a test.";

        using (var stream = new IsolatedStorageFileStream(fileName, FileMode.Create, IsolatedStorageFile.GetUserStoreForDomain()))
        {
            // Act
            using (var writer = new StreamWriter(stream))
            {
                writer.Write(fileContent);
            }
        }

        // Assert
        Assert.IsTrue(File.Exists(fileName));

        // Clean up
        File.Delete(fileName);
    }
}