86 lines
3.1 KiB
C#
86 lines
3.1 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Net.Http.Formatting;
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using System.Text;
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using Umbraco.Core;
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namespace Umbraco.Web
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{
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public static class FormDataCollectionExtensions
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{
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/// <summary>
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/// Converts a dictionary object to a query string representation such as:
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/// firstname=shannon&lastname=deminick
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/// </summary>
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/// <param name="items"></param>
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/// <param name="keysToIgnore">Any keys found in this collection will be removed from the output</param>
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/// <returns></returns>
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public static string ToQueryString(this FormDataCollection items, params string[] keysToIgnore)
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{
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if (items == null) return "";
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if (items.Any() == false) return "";
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var builder = new StringBuilder();
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foreach (var i in items.Where(i => keysToIgnore.InvariantContains(i.Key) == false))
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{
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builder.Append(string.Format("{0}={1}&", i.Key, i.Value));
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}
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return builder.ToString().TrimEnd('&');
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}
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/// <summary>
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/// Converts the FormCollection to a dictionary
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/// </summary>
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/// <param name="items"></param>
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/// <returns></returns>
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public static IDictionary<string, object> ToDictionary(this FormDataCollection items)
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{
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return items.ToDictionary(x => x.Key, x => (object)x.Value);
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}
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/// <summary>
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/// Returns the value of a mandatory item in the FormCollection
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/// </summary>
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/// <param name="items"></param>
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/// <param name="key"></param>
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/// <returns></returns>
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public static string GetRequiredString(this FormDataCollection items, string key)
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{
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if (items.HasKey(key) == false)
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throw new ArgumentNullException("The " + key + " query string parameter was not found but is required");
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return items.Single(x => x.Key.InvariantEquals(key)).Value;
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}
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/// <summary>
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/// Checks if the collection contains the key
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/// </summary>
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/// <param name="items"></param>
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/// <param name="key"></param>
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/// <returns></returns>
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public static bool HasKey(this FormDataCollection items, string key)
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{
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return items.Any(x => x.Key.InvariantEquals(key));
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}
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/// <summary>
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/// Returns the object based in the collection based on it's key. This does this with a conversion so if it doesn't convert a null object is returned.
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/// </summary>
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/// <typeparam name="T"></typeparam>
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/// <param name="items"></param>
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/// <param name="key"></param>
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/// <returns></returns>
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public static T GetValue<T>(this FormDataCollection items, string key)
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{
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var val = items.Get(key);
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if (string.IsNullOrEmpty(val)) return default(T);
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var converted = val.TryConvertTo<T>();
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return converted.Success
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? converted.Result
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: default(T);
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}
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}
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}
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