dictionary将键和值添加或替换到字典中：如果不存在，则添加；存在，则替换

/// <summary>
/// 将键和值添加或替换到字典中：如果不存在，则添加；存在，则替换
/// </summary>
public static Dictionary<TKey, TValue> AddOrPeplace<TKey, TValue>(this Dictionary<TKey, TValue> dict, TKey key, TValue value)
{
dict[key] = value;
return dict;
}