Add Count && SkipLines

Add Count && SkipLines

Author: JonathanMagnan

src/Z.IO/System.IO.FileInfo/FileInfo.CountLines.cs

@@ -0,0 +1,31 @@
+// Description: C# Extension Methods Library to enhances the .NET Framework by adding hundreds of new methods. It drastically increases developers productivity and code readability. Support C# and VB.NET
+// Website & Documentation: https://github.com/zzzprojects/Z.ExtensionMethods
+// Forum: https://github.com/zzzprojects/Z.ExtensionMethods/issues
+// License: https://github.com/zzzprojects/Z.ExtensionMethods/blob/master/LICENSE
+// More projects: http://www.zzzprojects.com/
+// Copyright © ZZZ Projects Inc. 2014 - 2016. All rights reserved.
+// 
+
+using System;
+using System.IO;
+using System.Linq;
+
+public static partial class Extensions
+{
+    /// <summary>Gets the total number of lines in a file. </summary>
+    /// <param name="this">The file to perform the count on.</param>
+    /// <returns>The total number of lines in a file. </returns>
+    public static int CountLines(this FileInfo @this)
+    {
+        return File.ReadAllLines(@this.FullName).Length;
+    }
+
+    /// <summary>Gets the total number of lines in a file that satisfy the condition in the predicate function.</summary>
+    /// <param name="this">The file to perform the count on.</param>
+    /// <param name="predicate">A function to test each line for a condition.</param>
+    /// <returns>The total number of lines in a file that satisfy the condition in the predicate function.</returns>
+    public static int CountLines(this FileInfo @this, Func<string, bool> predicate)
+    {
+        return File.ReadAllLines(@this.FullName).Count(predicate);
+    }
+}

src/Z.IO/System.IO.StreamReader/StreamReader.SkipLines.cs

@@ -0,0 +1,25 @@
+// Description: C# Extension Methods Library to enhances the .NET Framework by adding hundreds of new methods. It drastically increases developers productivity and code readability. Support C# and VB.NET
+// Website & Documentation: https://github.com/zzzprojects/Z.ExtensionMethods
+// Forum: https://github.com/zzzprojects/Z.ExtensionMethods/issues
+// License: https://github.com/zzzprojects/Z.ExtensionMethods/blob/master/LICENSE
+// More projects: http://www.zzzprojects.com/
+// Copyright © ZZZ Projects Inc. 2014 - 2016. All rights reserved.
+
+using System.IO;
+using System.Linq;
+
+public static partial class Extensions
+{
+    /// <summary>
+    ///     Skips the specified number of lines in a stream reader based on its current position.
+    /// </summary>
+    /// <param name="this">The stream reader.</param>
+    /// <param name="skipCount">The number of lines to skip.</param>
+    public static void SkipLines(this StreamReader @this, int skipCount)
+    {
+        for (var i = 0; i < skipCount && !@this.EndOfStream; i++)
+        {
+            @this.ReadLine();
+        }
+    }
+}

src/Z.IO/Z.IO.csproj

@@ -91,6 +91,7 @@
     <Compile Include="System.IO.FileInfo\FileInfo.AppendAllLines.cs" />
     <Compile Include="System.IO.FileInfo\FileInfo.AppendAllText.cs" />
     <Compile Include="System.IO.FileInfo\FileInfo.ChangeExtension.cs" />
+    <Compile Include="System.IO.FileInfo\FileInfo.CountLines.cs" />
     <Compile Include="System.IO.FileInfo\FileInfo.CreateDirectory.cs" />
     <Compile Include="System.IO.FileInfo\FileInfo.EnsureDirectoryExists.cs" />
     <Compile Include="System.IO.FileInfo\FileInfo.GetDirectoryFullName.cs" />
@@ -110,6 +111,7 @@
     <Compile Include="System.IO.FileInfo\FileInfo.WriteAllBytes.cs" />
     <Compile Include="System.IO.FileInfo\FileInfo.WriteAllLines.cs" />
     <Compile Include="System.IO.FileInfo\FileInfo.WriteAllText.cs" />
+    <Compile Include="System.IO.StreamReader\StreamReader.SkipLines.cs" />
     <Compile Include="System.IO.Stream\Stream.ReadToEnd.cs" />
     <Compile Include="System.IO.Stream\Stream.ToByteArray.cs" />
     <Compile Include="System.IO.Stream\Stream.ToMD5Hash.cs" />

test/Z.IO.Test/System.IO.StreamReader/StreamReader.SkipLines.cs

@@ -0,0 +1,39 @@
+// Description: C# Extension Methods Library to enhances the .NET Framework by adding hundreds of new methods. It drastically increases developers productivity and code readability. Support C# and VB.NET
+// Website & Documentation: https://github.com/zzzprojects/Z.ExtensionMethods
+// Forum: https://github.com/zzzprojects/Z.ExtensionMethods/issues
+// License: https://github.com/zzzprojects/Z.ExtensionMethods/blob/master/LICENSE
+// More projects: http://www.zzzprojects.com/
+// Copyright © ZZZ Projects Inc. 2014 - 2016. All rights reserved.
+using System;
+using System.IO;
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+
+namespace Z.IO.Test
+{
+    [TestClass]
+    public class System_IO_StreamReader_SkipLines
+    {
+        [TestMethod]
+        public void SkipLines()
+        {
+            var filePath = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "Examples_System_IO_FileInfo_SkipLines.txt");
+
+            File.WriteAllLines(filePath, new[]
+            {
+                "Line1",
+                "Line2",
+                "Line3",
+                "Line4"
+            });
+
+            using (var file = File.OpenText(filePath))
+            {
+                file.SkipLines(2);
+                var nextLine = file.ReadLine();
+
+                // Unit Test
+                Assert.AreEqual("Line3", nextLine);
+            }
+        }
+    }
+}

test/Z.IO.Test/Z.IO.Test.csproj

@@ -100,6 +100,7 @@
     <Compile Include="System.IO.FileInfo\FileInfo.WriteAllBytes.cs" />
     <Compile Include="System.IO.FileInfo\FileInfo.WriteAllLines.cs" />
     <Compile Include="System.IO.FileInfo\FileInfo.WriteAllText.cs" />
+    <Compile Include="System.IO.StreamReader\StreamReader.SkipLines.cs" />
     <Compile Include="System.IO.Stream\Stream.ReadToEnd.cs" />
     <Compile Include="System.IO.Stream\Stream.ToByteArray.cs" />
     <Compile Include="System.IO.Stream\Stream.ToMD5Hash.cs" />