我也在我的应用程序中使用Firebase Analytics。
下面是IDictionary<string, string>上的一个合适的扩展方法，任何人都可以使用它轻松地将C# IDictionary转换为iOS NSDictionary

/// <summary>
/// Converts an <see cref="IDictionary{TKey, TValue}"/> of string key-value pairs to an <see cref="NSDictionary"/> of <see cref="NSString"/> keys and <see cref="NSObject"/> values.
/// </summary>
/// <param name="dictionary">The dictionary to convert. Cannot be null.</param>
/// <returns>An <see cref="NSDictionary"/> with <see cref="NSString"/> keys and <see cref="NSObject"/> values corresponding to the entries in the input dictionary.</returns>
/// <exception cref="ArgumentNullException">Thrown if the input dictionary is null.</exception>
/// <remarks>
/// This method iterates over the input dictionary to create a pair of arrays for keys and values, which are then used to construct the NSDictionary.
/// It's designed to be used as an extension method for any IDictionary&lt;string, string&gt; instance.
/// Note: Null keys or values in the input dictionary will result in exceptions, as <see cref="NSString"/> cannot be instantiated with a null reference.
/// </remarks>
/// <example>
/// <code>
/// var myDict = new Dictionary&lt;string, string&gt; { { "key1", "value1" }, { "key2", "value2" } };
/// var nsDict = myDict.ToNSDictionary();
/// </code>
/// </example>
public static NSDictionary<NSString, NSObject> ToNSDictionary(this IDictionary<string, string> dictionary)
{
    ArgumentNullException.ThrowIfNull(dictionary);
    var keysAndValues = dictionary
        .Select(kv => (Key: new NSString(kv.Key), Value: new NSString(kv.Value)))
        .ToArray();
    var keys = keysAndValues
        .Select(kv => kv.Key)
        .ToArray();
    var values = keysAndValues
        .Select(kv => kv.Value)
        .ToArray();
    return new NSDictionary<NSString, NSObject>(keys, values);
}

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如果你需要，这里是另一个在IDictionary<string, object>

/// <summary>
/// Converts an <see cref="IDictionary{TKey, TValue}"/> of string key-value pairs to an <see cref="NSDictionary"/> of <see cref="NSString"/> keys and <see cref="NSObject"/> values.
/// </summary>
/// <param name="dictionary">The dictionary to convert. Cannot be null.</param>
/// <returns>An <see cref="NSDictionary"/> with <see cref="NSString"/> keys and <see cref="NSObject"/> values corresponding to the entries in the input dictionary.</returns>
/// <exception cref="ArgumentNullException">Thrown if the input dictionary is null.</exception>
/// <remarks>
/// This method iterates over the input dictionary to create a pair of arrays for keys and values, which are then used to construct the NSDictionary.
/// It's designed to be used as an extension method for any IDictionary&lt;string, object&gt; instance.
/// Note: Null keys or values in the input dictionary will result in exceptions, as <see cref="NSString"/> cannot be instantiated with a null reference.
/// </remarks>
/// <example>
/// <code>
/// var myDict = new Dictionary&lt;string, object&gt; { { "key1", object1 }, { "key2", object2 } };
/// var nsDict = myDict.ToNSDictionary();
/// </code>
/// </example>
public static NSDictionary<NSString, NSObject> ToNSDictionary(this IDictionary<string, object> dictionary)
{
    ArgumentNullException.ThrowIfNull(dictionary);
    var keys = dictionary.Keys
        .Select(arg => new NSString(arg))
        .ToArray();
    var objects = dictionary.Values
        .Select(NSObject.FromObject)
        .ToArray();
    return new NSDictionary<NSString, NSObject>(keys, objects);
}

型
仅供参考：我使用ArgumentNullException.ThrowIfNull =>仅从C#10开始可用，如果您在C#10以下，请使用经典方式。

作为一种解决方法，您可以尝试以下方法来创建参数，

var keys = new NSObject[]
{
    new NSString(ItemName),
};
var objects = new NSObject[]
{ 
    new NSString(title),
};
NSDictionary dicionary = new NSDictionary<NSObject, NSObject>(keys, objects);
NSArray items =  NSArray.FromNSObjects(dicionary);
var parameters = new Dictionary<object, object>
{
    { ParameterNamesConstants.Currency, currencyCode },
    { ParameterNamesConstants.Value, value },
    { ParameterNamesConstants.Items, items }
};

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