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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
using System.Text.Json;
namespace Microsoft.JSInterop.Implementation;
/// <summary>
/// Used by JsonConverters to read or write a <see cref="IJSObjectReference"/> instance.
/// <para>
/// This type is part of ASP.NET Core's internal infrastructure and is not recommended for use by external code.
/// </para>
/// </summary>
public static class JSObjectReferenceJsonWorker
{
internal static readonly JsonEncodedText JSObjectIdKey = JsonEncodedText.Encode("__jsObjectId");
/// <summary>
/// Reads the id for a <see cref="JSObjectReference"/> instance.
/// </summary>
/// <param name="reader">The <see cref="Utf8JsonReader"/></param>
/// <returns>The deserialized id for the <see cref="JSObjectReference"/>.</returns>
public static long ReadJSObjectReferenceIdentifier(ref Utf8JsonReader reader)
{
long? id = null;
while (reader.Read() && reader.TokenType != JsonTokenType.EndObject)
{
if (reader.TokenType == JsonTokenType.PropertyName)
{
if (id is null && reader.ValueTextEquals(JSObjectIdKey.EncodedUtf8Bytes))
{
reader.Read();
id = reader.GetInt64();
}
else
{
throw new JsonException($"Unexpected JSON property {reader.GetString()}.");
}
}
else
{
throw new JsonException($"Unexpected JSON token {reader.TokenType}");
}
}
if (!id.HasValue)
{
throw new JsonException($"Required property {JSObjectIdKey} not found.");
}
return id.Value;
}
/// <summary>
/// Writes a <see cref="JSObjectReference"/> to the <paramref name="objectReference"/>.
/// </summary>
/// <param name="writer">The <see cref="Utf8JsonWriter"/>.</param>
/// <param name="objectReference">The <see cref="JSObjectReference"/> to write.</param>
public static void WriteJSObjectReference(Utf8JsonWriter writer, JSObjectReference objectReference)
{
writer.WriteStartObject();
writer.WriteNumber(JSObjectIdKey, objectReference.Id);
writer.WriteEndObject();
}
}
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