Get tests working with different regional formatting

- fixes #1959, "[unit tests] 3 test failures with non-default long time format"
- tests failed if system configured w/ non-default time formats
- Linq expression constants were converted to strings using system culture
- now converted using invariant culture

test/System.Web.OData.Test/OData/Query/Expressions/ExpressionStringBuilder.cs

@@ -1,6 +1,7 @@
 // Copyright (c) Microsoft Open Technologies, Inc. All rights reserved. See License.txt in the project root for license information.
 
 using System.Collections.Generic;
+using System.Globalization;
 using System.Linq;
 using System.Linq.Expressions;
 using System.Text;
@@ -72,21 +73,24 @@ namespace System.Web.OData.Query.Expressions
             else
             {
                 LinqParameterContainer container = node.Value as LinqParameterContainer;
+                string stringValue;
                 if (container != null)
                 {
-                    string stringValue = container.Property as string;
+                    stringValue = container.Property as string;
                     if (stringValue != null)
                     {
                         Out("\"" + stringValue + "\"");
                     }
                     else
                     {
-                        Out(container.Property.ToString());
+                        stringValue = String.Format(CultureInfo.InvariantCulture, "{0}", container.Property);
+                        Out(stringValue);
                     }
                 }
                 else
                 {
-                    Out(node.Value.ToString());
+                    stringValue = String.Format(CultureInfo.InvariantCulture, "{0}", node.Value);
+                    Out(stringValue);
                 }
             }
 

test/System.Web.OData.Test/OData/Query/Expressions/FilterBinderTests.cs

@@ -1520,7 +1520,7 @@ namespace System.Web.OData.Query.Expressions
         [InlineData("cast(null,Edm.Byte) ne 1", "$it => (null != Convert(1))")]
         [InlineData("cast(null,Edm.Guid) eq 00000000-0000-0000-0000-000000000000", "$it => (null == Convert(00000000-0000-0000-0000-000000000000))")]
         [InlineData("cast(null,Edm.String) ne '123'", "$it => (null != \"123\")")]
-        [InlineData("cast(null,Edm.DateTimeOffset) eq 2001-01-01T12:00:00.000+08:00", "$it => (null == Convert(1/1/2001 12:00:00 PM +08:00))")]
+        [InlineData("cast(null,Edm.DateTimeOffset) eq 2001-01-01T12:00:00.000+08:00", "$it => (null == Convert(01/01/2001 12:00:00 +08:00))")]
         [InlineData("cast(null,Edm.Duration) eq duration'P8DT23H59M59.9999S'", "$it => (null == Convert(8.23:59:59.9999000))")]
         [InlineData("cast(null,'Microsoft.TestCommon.Types.SimpleEnum') eq null", "$it => (null == null)")]
         [InlineData("cast(null,'Microsoft.TestCommon.Types.FlagsEnum') eq null", "$it => (null == null)")]
@@ -1676,7 +1676,7 @@ namespace System.Web.OData.Query.Expressions
         [InlineData("FloatProp eq @p", "1.23", "$it => ($it.FloatProp == 1.23)")]
         [InlineData("DoubleProp eq @p", "4.56", "$it => ($it.DoubleProp == Convert(4.56))")]
         [InlineData("StringProp eq @p", "'abc'", "$it => ($it.StringProp == \"abc\")")]
-        [InlineData("DateTimeOffsetProp eq @p", "2001-01-01T12:00:00.000+08:00", "$it => ($it.DateTimeOffsetProp == 1/1/2001 12:00:00 PM +08:00)")]
+        [InlineData("DateTimeOffsetProp eq @p", "2001-01-01T12:00:00.000+08:00", "$it => ($it.DateTimeOffsetProp == 01/01/2001 12:00:00 +08:00)")]
         [InlineData("TimeSpanProp eq @p", "duration'P8DT23H59M59.9999S'", "$it => ($it.TimeSpanProp == 8.23:59:59.9999000)")]
         [InlineData("GuidProp eq @p", "00000000-0000-0000-0000-000000000000", "$it => ($it.GuidProp == 00000000-0000-0000-0000-000000000000)")]
         [InlineData("SimpleEnumProp eq @p", "Microsoft.TestCommon.Types.SimpleEnum'First'", "$it => (Convert($it.SimpleEnumProp) == 0)")]
@@ -1698,7 +1698,7 @@ namespace System.Web.OData.Query.Expressions
         [InlineData("@p eq 1.23", "FloatProp", "$it => ($it.FloatProp == 1.23)")]
         [InlineData("@p eq 4.56", "NullableDoubleProp", "$it => ($it.NullableDoubleProp == Convert(4.56))")]
         [InlineData("@p eq 'abc'", "StringProp", "$it => ($it.StringProp == \"abc\")")]
-        [InlineData("@p eq 2001-01-01T12:00:00.000+08:00", "DateTimeOffsetProp", "$it => ($it.DateTimeOffsetProp == 1/1/2001 12:00:00 PM +08:00)")]
+        [InlineData("@p eq 2001-01-01T12:00:00.000+08:00", "DateTimeOffsetProp", "$it => ($it.DateTimeOffsetProp == 01/01/2001 12:00:00 +08:00)")]
         [InlineData("@p eq duration'P8DT23H59M59.9999S'", "TimeSpanProp", "$it => ($it.TimeSpanProp == 8.23:59:59.9999000)")]
         [InlineData("@p eq 00000000-0000-0000-0000-000000000000", "GuidProp", "$it => ($it.GuidProp == 00000000-0000-0000-0000-000000000000)")]
         [InlineData("@p eq Microsoft.TestCommon.Types.SimpleEnum'First'", "SimpleEnumProp", "$it => (Convert($it.SimpleEnumProp) == 0)")]