Assembles a series of key=value pairs as a URI-escaped query-string.
//-----------------------------------------------------------------------
// <copyright file="Utilities.cs">
// Copyright (c) Andrew Arnott. All rights reserved.
// </copyright>
// <license>
// Microsoft Public License (Ms-PL http://opensource.org/licenses/ms-pl.html).
// Contributors may add their own copyright notice above.
// </license>
//-----------------------------------------------------------------------
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Runtime.InteropServices;
using System.Security;
using System.Text;
namespace LinqToTwitter
{
public static class Utilities
{
/// <summary>
/// Creates a new Uri based on a given Uri, with an appended query string containing all the given parameters.
/// </summary>
/// <param name="requestUri">The request URI.</param>
/// <param name="parameters">The parameters.</param>
/// <returns>A new Uri instance.</returns>
internal static Uri AppendQueryString(Uri requestUri, IEnumerable<KeyValuePair<string, string>> parameters)
{
if (requestUri == null)
{
throw new ArgumentNullException("requestUri");
}
if (parameters == null)
{
return requestUri;
}
UriBuilder builder = new UriBuilder(requestUri);
if (!string.IsNullOrEmpty(builder.Query))
{
builder.Query += "&" + BuildQueryString(parameters);
}
else
{
builder.Query = BuildQueryString(parameters);
}
return builder.Uri;
}
/// <summary>
/// Assembles a series of key=value pairs as a URI-escaped query-string.
/// </summary>
/// <param name="parameters">The parameters to include.</param>
/// <returns>A query-string-like value such as a=b&c=d. Does not include a leading question mark (?).</returns>
internal static string BuildQueryString(IEnumerable<KeyValuePair<string, string>> parameters)
{
if (parameters == null)
{
throw new ArgumentNullException("parameters");
}
StringBuilder builder = new StringBuilder();
foreach (var pair in parameters.Where(p => !string.IsNullOrEmpty(p.Value)))
{
if (builder.Length > 0)
{
builder.Append("&");
}
builder.Append(Uri.EscapeDataString(pair.Key));
builder.Append("=");
builder.Append(Uri.EscapeDataString(pair.Value));
}
return builder.ToString();
}
}
}
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