Imported Upstream version 4.2.0.179

Former-commit-id: 4610231f55806d2a05ed69e5ff3faa7336cc1479

external/referencesource/System.Configuration/System/Configuration/StringUtil.cs

@@ -0,0 +1,99 @@
+//------------------------------------------------------------------------------
+// <copyright file="StringUtil.cs" company="Microsoft">
+//     Copyright (c) Microsoft Corporation.  All rights reserved.
+// </copyright>
+//------------------------------------------------------------------------------
+
+namespace System.Configuration {
+    using System.Collections;
+    using System.Collections.Specialized;
+    using System.Configuration;
+    using System.Globalization;
+    using System.IO;
+    using System.Runtime.InteropServices;
+    using System.Security.Permissions;
+    using System.Security;
+    using System.Text;
+    using System.Xml;
+    using Microsoft.Win32;
+
+    static internal class StringUtil {
+
+#if UNUSED_CODE
+        /*
+         * Determines if two strings are equal.
+         */
+        internal static bool Equals(string s1, string s2) {
+            return String.Equals(s1, s2, StringComparison.Ordinal);
+        }
+#endif
+
+        /*
+         * Determines if two strings are equal. Treats null and String.Empty as equivalent.
+         */
+        internal static bool EqualsNE(string s1, string s2) {
+            if (s1 == null) {
+                s1 = String.Empty;
+            }
+
+            if (s2 == null) {
+                s2 = String.Empty;
+            }
+
+            return String.Equals(s1, s2, StringComparison.Ordinal);
+        }
+
+        /*
+         * Determines if two strings are equal, ignoring case.
+         */
+        internal static bool EqualsIgnoreCase(string s1, string s2) {
+            return String.Equals(s1, s2, StringComparison.OrdinalIgnoreCase);
+        }
+
+#if UNUSED_CODE
+        /*
+         * Determines if two strings are equal, ignoring case. Treats null and String.Empty as equivalent.
+         */
+        internal static bool EqualsIgnoreCaseNE(string s1, string s2) {
+            if (s1 == null) {
+                s1 = String.Empty;
+            }
+
+            if (s2 == null) {
+                s2 = String.Empty;
+            }
+
+            return String.Equals(s1, s2, StringComparison.OrdinalIgnoreCase);
+        }
+#endif
+
+        /*
+         * Determines if the first string starts with the second string, ignoring case.
+         */
+        internal static bool StartsWith(string s1, string s2) {
+            if (s2 == null) {
+                return false;
+            }
+
+            return 0 == String.Compare(s1, 0, s2, 0, s2.Length, StringComparison.Ordinal);
+        }
+
+        /*
+         * Determines if the first string starts with the second string, ignoring case.
+         */
+        internal static bool StartsWithIgnoreCase(string s1, string s2) {
+            if (s2 == null) {
+                return false;
+            }
+
+            return 0 == String.Compare(s1, 0, s2, 0, s2.Length, StringComparison.OrdinalIgnoreCase);
+        }
+        
+        internal static string[] ObjectArrayToStringArray(object[] objectArray) {
+            String[] stringKeys = new String[objectArray.Length];
+            objectArray.CopyTo(stringKeys, 0);
+            return stringKeys;
+        }
+
+    }
+}