Add AppendIf, StringBuilder now return the StringBuilder

src/Z.Core/System.String/String.Concatenate.cs

@@ -0,0 +1,37 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+public static partial class Extensions
+{
+    /// <summary>An IEnumerable&lt;string&gt; extension method that concatenates the given this.</summary>
+    /// <param name="this">The @this to act on.</param>
+    /// <returns>A string.</returns>
+    public static string Concatenate(this IEnumerable<string> @this)
+    {
+        var sb = new StringBuilder();
+
+        foreach (var s in @this)
+        {
+            sb.Append(s);
+        }
+
+        return sb.ToString();
+    }
+
+    /// <summary>An IEnumerable&lt;T&gt; extension method that concatenates.</summary>
+    /// <typeparam name="T">Generic type parameter.</typeparam>
+    /// <param name="source">The source to act on.</param>
+    /// <param name="func">The function.</param>
+    /// <returns>A string.</returns>
+    public static string Concatenate<T>(this IEnumerable<T> source, Func<T, string> func)
+    {
+        var sb = new StringBuilder();
+        foreach (var item in source)
+        {
+            sb.Append(func(item));
+        }
+
+        return sb.ToString();
+    }
+}

src/Z.Core/System.Text.StringBuilder/StringBuilder.AppendIf.cs

@@ -0,0 +1,24 @@
+using System;
+using System.Text;
+
+public static partial class Extensions
+{
+    /// <summary>A StringBuilder extension method that appends a when.</summary>
+    /// <typeparam name="T">Generic type parameter.</typeparam>
+    /// <param name="this">The @this to act on.</param>
+    /// <param name="predicate">The predicate.</param>
+    /// <param name="values">A variable-length parameters list containing values.</param>
+    /// <returns>A StringBuilder.</returns>
+    public static StringBuilder AppendIf<T>(this StringBuilder @this, Func<T, bool> predicate, params T[] values)
+    {
+        foreach (var value in values)
+        {
+            if (predicate(value))
+            {
+                @this.Append(value);
+            }
+        }
+
+        return @this;
+    }
+}

src/Z.Core/System.Text.StringBuilder/StringBuilder.AppendJoin.cs

@@ -8,17 +8,21 @@ public static partial class Extensions
     /// <param name="this">The @this to act on.</param>
     /// <param name="separator">The separator.</param>
     /// <param name="values">The values.</param>
-    public static void AppendJoin<T>(this StringBuilder @this, string separator, IEnumerable<T> values)
+    public static StringBuilder AppendJoin<T>(this StringBuilder @this, string separator, IEnumerable<T> values)
     {
         @this.Append(string.Join(separator, values));
+
+        return @this;
     }
 
     /// <summary>A StringBuilder extension method that appends a join.</summary>
     /// <param name="this">The @this to act on.</param>
     /// <param name="separator">The separator.</param>
     /// <param name="values">The values.</param>
-    public static void AppendJoin(this StringBuilder @this, string separator, params object[] values)
+    public static StringBuilder AppendJoin<T>(this StringBuilder @this, string separator, params T[] values)
     {
         @this.Append(string.Join(separator, values));
+
+        return @this;
     }
 }

src/Z.Core/System.Text.StringBuilder/StringBuilder.AppendLineFormat.cs

@@ -15,9 +15,11 @@ public static partial class Extensions
     /// <param name="this">The @this to act on.</param>
     /// <param name="format">Describes the format to use.</param>
     /// <param name="args">A variable-length parameters list containing arguments.</param>
-    public static void AppendLineFormat(this StringBuilder @this, string format, params object[] args)
+    public static StringBuilder AppendLineFormat(this StringBuilder @this, string format, params object[] args)
     {
         @this.AppendLine(string.Format(format, args));
+
+        return @this;
     }
 
     /// <summary>
@@ -26,8 +28,10 @@ public static void AppendLineFormat(this StringBuilder @this, string format, par
     /// <param name="this">The @this to act on.</param>
     /// <param name="format">Describes the format to use.</param>
     /// <param name="args">A variable-length parameters list containing arguments.</param>
-    public static void AppendLineFormat(this StringBuilder @this, string format, List<IEnumerable<object>> args)
+    public static StringBuilder AppendLineFormat(this StringBuilder @this, string format, List<IEnumerable<object>> args)
     {
         @this.AppendLine(string.Format(format, args));
+
+        return @this;
     }
 }

src/Z.Core/System.Text.StringBuilder/StringBuilder.AppendLineIf.cs

@@ -0,0 +1,30 @@
+// Copyright (c) 2015 ZZZ Projects. All rights reserved
+// Licensed under MIT License (MIT) (https://github.com/zzzprojects/Z.ExtensionMethods)
+// Website: http://www.zzzprojects.com/
+// Feedback / Feature Requests / Issues : http://zzzprojects.uservoice.com/forums/283927
+// All ZZZ Projects products: Entity Framework Extensions / Bulk Operations / Extension Methods /Icon Library
+
+using System;
+using System.Text;
+
+public static partial class Extensions
+{
+    /// <summary>A StringBuilder extension method that appends a line when.</summary>
+    /// <typeparam name="T">Generic type parameter.</typeparam>
+    /// <param name="this">The @this to act on.</param>
+    /// <param name="predicate">The predicate.</param>
+    /// <param name="values">A variable-length parameters list containing values.</param>
+    /// <returns>A StringBuilder.</returns>
+    public static StringBuilder AppendLineIf<T>(this StringBuilder @this, Func<T, bool> predicate, params T[] values)
+    {
+        foreach (var value in values)
+        {
+            if (predicate(value))
+            {
+                @this.AppendLine(value.ToString());
+            }
+        }
+
+        return @this;
+    }
+}

src/Z.Core/System.Text.StringBuilder/StringBuilder.AppendLineJoin.cs

@@ -1,3 +1,10 @@
+// Copyright (c) 2015 ZZZ Projects. All rights reserved
+// Licensed under MIT License (MIT) (https://github.com/zzzprojects/Z.ExtensionMethods)
+// Website: http://www.zzzprojects.com/
+// Feedback / Feature Requests / Issues : http://zzzprojects.uservoice.com/forums/283927
+// All ZZZ Projects products: Entity Framework Extensions / Bulk Operations / Extension Methods /Icon Library
+
+
 using System.Collections.Generic;
 using System.Text;
 
@@ -8,17 +15,21 @@ public static partial class Extensions
     /// <param name="this">The @this to act on.</param>
     /// <param name="separator">The separator.</param>
     /// <param name="values">The values.</param>
-    public static void AppendLineJoin<T>(this StringBuilder @this, string separator, IEnumerable<T> values)
+    public static StringBuilder AppendLineJoin<T>(this StringBuilder @this, string separator, IEnumerable<T> values)
     {
         @this.AppendLine(string.Join(separator, values));
+
+        return @this;
     }
 
     /// <summary>A StringBuilder extension method that appends a line join.</summary>
     /// <param name="this">The @this to act on.</param>
     /// <param name="separator">The separator.</param>
     /// <param name="values">The values.</param>
-    public static void AppendLineJoin(this StringBuilder @this, string separator, params object[] values)
+    public static StringBuilder AppendLineJoin(this StringBuilder @this, string separator, params object[] values)
     {
         @this.AppendLine(string.Join(separator, values));
+
+        return @this;
     }
 }

src/Z.Core/Z.Core.csproj

@@ -627,6 +627,9 @@
     <Compile Include="System.String\_ExtractValueType\String.ExtractUInt32.cs" />
     <Compile Include="System.String\_ExtractValueType\String.ExtractUInt64.cs" />
     <Compile Include="System.Text.StringBuilder\StringBuilder.AppendJoin.cs" />
+    <Compile Include="System.String\String.Concatenate.cs" />
+    <Compile Include="System.Text.StringBuilder\StringBuilder.AppendLineIf.cs" />
+    <Compile Include="System.Text.StringBuilder\StringBuilder.AppendIf.cs" />
     <Compile Include="System.Text.StringBuilder\StringBuilder.Substring.cs" />
     <Compile Include="System.Text.StringBuilder\StringBuilder.GetIndexAfterNextDoubleQuote.cs" />
     <Compile Include="System.Text.StringBuilder\StringBuilder.GetIndexAfterNextSingleQuote.cs" />

test/Z.Core.Test/System.String/String.Concatenate.cs

@@ -0,0 +1,29 @@
+// Copyright (c) 2015 ZZZ Projects. All rights reserved
+// Licensed under MIT License (MIT) (https://github.com/zzzprojects/Z.ExtensionMethods)
+// Website: http://www.zzzprojects.com/
+// Feedback / Feature Requests / Issues : http://zzzprojects.uservoice.com/forums/283927
+// All ZZZ Projects products: Entity Framework Extensions / Bulk Operations / Extension Methods /Icon Library
+
+using System.Collections.Generic;
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+
+namespace Z.Core.Test
+{
+    [TestClass]
+    public class System_Text_StringBuilder_Concatenate
+    {
+        [TestMethod]
+        public void Concatenate()
+        {
+            var list = new List<string> {"Fizz", "Buzz"};
+
+            // Exemples
+            var result1 = list.Concatenate();
+            var result2 = list.Concatenate(x => x + x);
+
+            // Unit Test
+            Assert.AreEqual("FizzBuzz", result1);
+            Assert.AreEqual("FizzFizzBuzzBuzz", result2);
+        }
+    }
+}

test/Z.Core.Test/System.Text.StringBuilder/StringBuilder.AppendIf.cs

@@ -0,0 +1,28 @@
+// Copyright (c) 2015 ZZZ Projects. All rights reserved
+// Licensed under MIT License (MIT) (https://github.com/zzzprojects/Z.ExtensionMethods)
+// Website: http://www.zzzprojects.com/
+// Feedback / Feature Requests / Issues : http://zzzprojects.uservoice.com/forums/283927
+// All ZZZ Projects products: Entity Framework Extensions / Bulk Operations / Extension Methods /Icon Library
+
+using System.Text;
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+
+namespace Z.Core.Test
+{
+    [TestClass]
+    public class System_Text_StringBuilder_AppendIf
+    {
+        [TestMethod]
+        public void AppendIf()
+        {
+            // Type
+            var @this = new StringBuilder();
+
+            // Exemples
+            @this.AppendIf(x => x.Contains("F"), "Fizz", "Buzz"); // return "FizzBuzz";
+
+            // Unit Test
+            Assert.AreEqual("Fizz", @this.ToString());
+        }
+    }
+}

test/Z.Core.Test/System.Text.StringBuilder/StringBuilder.AppendLineIf.cs

@@ -0,0 +1,28 @@
+// Copyright (c) 2015 ZZZ Projects. All rights reserved
+// Licensed under MIT License (MIT) (https://github.com/zzzprojects/Z.ExtensionMethods)
+// Website: http://www.zzzprojects.com/
+// Feedback / Feature Requests / Issues : http://zzzprojects.uservoice.com/forums/283927
+// All ZZZ Projects products: Entity Framework Extensions / Bulk Operations / Extension Methods /Icon Library
+
+using System.Text;
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+
+namespace Z.Core.Test
+{
+    [TestClass]
+    public class System_Text_StringBuilder_AppendLineIf
+    {
+        [TestMethod]
+        public void AppendLineIf()
+        {
+            // Type
+            var @this = new StringBuilder();
+
+            // Exemples
+            @this.AppendLineIf(x => x.Contains("F"), "Fizz", "Buzz"); // return "FizzBuzz";
+
+            // Unit Test
+            Assert.AreEqual("Fizz", @this.ToString());
+        }
+    }
+}

test/Z.Core.Test/Z.Core.Test.csproj

@@ -219,8 +219,11 @@
     <Compile Include="System.String\String.ToXDocument.cs" />
     <Compile Include="System.String\String.ToXmlDocument.cs" />
     <Compile Include="System.String\String.Truncate.cs" />
+    <Compile Include="System.String\String.Concatenate.cs" />
     <Compile Include="System.Text.StringBuilder\StringBuilder.AppendJoin.cs" />
     <Compile Include="System.Text.StringBuilder\StringBuilder.AppendJoinLine.cs" />
+    <Compile Include="System.Text.StringBuilder\StringBuilder.AppendLineIf.cs" />
+    <Compile Include="System.Text.StringBuilder\StringBuilder.AppendIf.cs" />
     <Compile Include="System.Text.StringBuilder\StringBuilder.Substring.cs" />
     <Compile Include="System.Text.StringBuilder\StringBuilder.AppendLineFormat.cs" />
     <Compile Include="System.TimeSpan\TimeSpan.Ago.cs" />