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/// Merges a key/value pair into the dictionary. If the key already exists, the existing value and new value are combined using the specified function; otherwise, the key/value pair is added directly.
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/// </remarks>
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/// <typeparam name="TKey">键的类型 / The type of the keys in the dictionary.</typeparam>
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/// <typeparam name="TValue">值的类型 / The type of the values in the dictionary.</typeparam>
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/// <param name="self">要合并的字典，不能为 null / The dictionary to merge into, cannot be null.</param>
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/// <param name="key">要添加或合并的键 / The key to add or merge.</param>
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/// <param name="v">要添加或合并的值 / The value to add or merge.</param>
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/// <param name="func">用于合并值的函数，接收两个参数：现有值和新值，返回合并后的结果，不能为 null / The function to use to merge values if the key exists, cannot be null.</param>
/// Gets the value associated with the specified key. If the key does not exist, the value is created using the specified function and added to the dictionary.
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/// </remarks>
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/// <typeparam name="TKey">键的类型 / The type of the keys in the dictionary.</typeparam>
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/// <typeparam name="TValue">值的类型 / The type of the values in the dictionary.</typeparam>
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/// <param name="self">要操作的字典，不能为 null / The dictionary to operate on, cannot be null.</param>
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/// <param name="key">要获取值的键 / The key whose value to get.</param>
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/// <param name="valueGetter">用于获取值的函数，接收键作为参数并返回对应的值，不能为 null / The function to use to generate a value if the key is not found, cannot be null.</param>
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/// <returns>指定键的值。如果键不存在，则返回新创建的值 / The value associated with the specified key. If the key does not exist, returns the newly created value.</returns>
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/// <exception cref="ArgumentNullException">当 <paramref name="self"/>、<paramref name="key"/>（如果是引用类型）或 <paramref name="valueGetter"/> 为 null 时抛出 / Thrown when <paramref name="self"/>, <paramref name="key"/> (if reference type), or <paramref name="valueGetter"/> is null.</exception>
/// Gets the value associated with the specified key. If the key does not exist, a new value is created using the parameterless constructor and added to the dictionary.
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/// </remarks>
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/// <typeparam name="TKey">键的类型 / The type of the keys in the dictionary.</typeparam>
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/// <typeparam name="TValue">值的类型，必须包含无参构造函数 / The type of the values in the dictionary, must have a parameterless constructor.</typeparam>
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/// <param name="self">要操作的字典，不能为 null / The dictionary to operate on, cannot be null.</param>
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/// <param name="key">要获取值的键 / The key whose value to get.</param>
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/// <returns>指定键的值。如果键不存在，则返回新创建的值 / The value associated with the specified key. If the key does not exist, returns the newly created value.</returns>
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/// <exception cref="ArgumentNullException">当 <paramref name="self"/> 或 <paramref name="key"/> 为 null 时抛出 / Thrown when <paramref name="self"/> or <paramref name="key"/> is null.</exception>
/// Removes all key/value pairs from the dictionary that match the specified condition.
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/// This method iterates through all key/value pairs and removes those where the predicate returns true.
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/// To avoid modifying the collection during iteration, keys to remove are collected first, then removed.
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/// </remarks>
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/// <typeparam name="TKey">键的类型 / The type of the keys in the dictionary.</typeparam>
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/// <typeparam name="TValue">值的类型 / The type of the values in the dictionary.</typeparam>
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/// <param name="self">要操作的字典，不能为 null / The dictionary to operate on, cannot be null.</param>
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/// <param name="predict">判断是否移除键值对的条件，接收键和值作为参数，返回true表示需要移除，不能为 null / The predicate function to determine which items to remove, cannot be null.</param>
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/// <returns>移除的键值对数量 / The number of items removed.</returns>
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/// <exception cref="ArgumentNullException">当 <paramref name="self"/> 或 <paramref name="predict"/> 为 null 时抛出 / Thrown when <paramref name="self"/> or <paramref name="predict"/> is null.</exception>
/// Removes all elements from the list that match the specified condition.
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/// This method uses <see cref="List{T}.RemoveAll(Predicate{T})"/> to remove all matching elements at once.
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/// </remarks>
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/// <typeparam name="T">列表元素的类型 / The type of elements in the list.</typeparam>
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/// <param name="list">要操作的列表，不能为 null / The list to operate on, cannot be null.</param>
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/// <param name="condition">用于判断元素是否满足移除条件的委托，返回true表示需要移除，不能为 null / The predicate function to determine which items to remove, cannot be null.</param>
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/// <exception cref="ArgumentNullException">当 <paramref name="list"/> 或 <paramref name="condition"/> 为 null 时抛出 / Thrown when <paramref name="list"/> or <paramref name="condition"/> is null.</exception>
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