C# File.createNewFile方法代码示例

 public void createNewFileTest()
 {
     File target = new File(this.tempPath,"HereIAm.file"); // TODO: Initialize to an appropriate value
     if (target.exists()) target.delete();
     Assert.IsFalse(target.exists());
     bool created = target.createNewFile();
     Assert.IsTrue(created);
     target = new File(target.getAbsolutePath());
     Assert.IsTrue(target.exists());
 }

 public void listTest()
 {
     File target = new File(this.tempPath); // TODO: Initialize to an appropriate value
     File toList = new File(target, "ListMe.file");
     toList.createNewFile();
     string[] actual = target.list();
     Assert.IsTrue(actual.Length > 0);
     Assert.IsTrue(actual[0].startsWith(target.getAbsolutePath()));
     bool findToList = false;
     foreach (String file in actual) {
         if (file.equals(toList.getAbsolutePath()))
         {
             findToList = true;
             break;
         }
     }
     Assert.IsTrue(findToList);
 }

        public void isFileTest()
        {
            File target = new File(this.tempPath); // TODO: Initialize to an appropriate value
            bool expected = false; // TODO: Initialize to an appropriate value
            bool actual;
            actual = target.isFile();
            Assert.AreEqual(expected, actual);

            target = new File(this.tempPath,"Yes.file"); // TODO: Initialize to an appropriate value
            target.createNewFile();
            target = new File(target.getAbsolutePath()); // .net caching file status, so after create make new File instance
            Assert.IsTrue(target.exists());
            expected = true; // TODO: Initialize to an appropriate value
            actual = target.isFile();
            Assert.AreEqual(expected, actual);

            target = new File(string.Empty); // TODO: Initialize to an appropriate value
            expected = false; // TODO: Initialize to an appropriate value
            actual = target.isFile();
            Assert.AreEqual(expected, actual);
        }

 public void deleteTest()
 {
     File target = new File(tempPath,"Erease.Me"); // TODO: Initialize to an appropriate value
     target.createNewFile();
     Assert.IsTrue(target.exists());
     bool expected = true; // TODO: Initialize to an appropriate value
     bool actual = target.delete();
     Assert.AreEqual(expected, actual);
 }

		/// <summary>
		/// Save PNG image with background color
		/// </summary>
		/// <param name="strFileName">
		///            Save file path </param>
		/// <param name="bitmap">
		///            Input bitmap </param>
		/// <param name="nQuality">
		///            Jpeg quality for saving </param>
		/// <param name="nBackgroundColor">
		///            background color </param>
		/// <returns> whether success or not </returns>
		public static bool saveBitmapPNGWithBackgroundColor(string strFileName, Bitmap bitmap, int nBackgroundColor)
		{
			bool bSuccess1 = false;
			bool bSuccess2 = false;
			bool bSuccess3;
			File saveFile = new File(strFileName);

			if (saveFile.exists())
			{
				if (!saveFile.delete())
				{
					return false;
				}
			}

			int nA = (nBackgroundColor >> 24) & 0xff;

			// If Background color alpha is 0, Background color substitutes as white
			if (nA == 0)
			{
				nBackgroundColor = unchecked((int)0xFFFFFFFF);
			}

			Rect rect = new Rect(0, 0, bitmap.Width, bitmap.Height);
			Bitmap newBitmap = Bitmap.createBitmap(bitmap.Width, bitmap.Height, Bitmap.Config.ARGB_8888);
			Canvas canvas = new Canvas(newBitmap);
			canvas.drawColor(nBackgroundColor);
			canvas.drawBitmap(bitmap, rect, rect, new Paint());

			System.IO.Stream @out = null;

			try
			{
				bSuccess1 = saveFile.createNewFile();
			}
			catch (IOException e1)
			{
				// TODO Auto-generated catch block
				Console.WriteLine(e1.ToString());
				Console.Write(e1.StackTrace);
			}

			try
			{
				@out = new System.IO.FileStream(saveFile, System.IO.FileMode.Create, System.IO.FileAccess.Write);
				bSuccess2 = newBitmap.compress(Bitmap.CompressFormat.PNG, 100, @out);
			}
			catch (Exception e)
			{
				Console.WriteLine(e.ToString());
				Console.Write(e.StackTrace);
			}

			try
			{
				if (@out != null)
				{
					@out.Flush();
					@out.Close();
					bSuccess3 = true;
				}
				else
				{
					bSuccess3 = false;
				}

			}
			catch (IOException e)
			{
				Console.WriteLine(e.ToString());
				Console.Write(e.StackTrace);
				bSuccess3 = false;
			}
			finally
			{
				if (@out != null)
				{
					try
					{
						@out.Close();
					}
					catch (IOException e)
					{
						// TODO Auto-generated catch block
						Console.WriteLine(e.ToString());
						Console.Write(e.StackTrace);
					}
				}
//.........这里部分代码省略.........

		/// <summary>
		/// save an bitmap object.
		/// </summary>
		private void saveImage(Bitmap bitmap, string filename)
		{

			if (bitmap != null)
			{

				File file = new File(filename);
				System.IO.Stream @out = null;
				try
				{
					file.createNewFile();
					@out = new System.IO.FileStream(file, System.IO.FileMode.Create, System.IO.FileAccess.Write);
					bitmap.compress(Bitmap.CompressFormat.JPEG, 95, @out);
					bitmap.recycle();
				}
				catch (Exception e)
				{
					Console.WriteLine(e.ToString());
					Console.Write(e.StackTrace);
				}
				finally
				{
					if (@out != null)
					{
						try
						{
						@out.Close();
						}
						catch (IOException e)
						{
							Console.WriteLine(e.ToString());
							Console.Write(e.StackTrace);
						}
					}
				}

			}
		}