Xamarin iOS Firebase 分析

Question

我不明白如何使用参数中的数组项来记录事件。

例如，如果我需要记录类似 EventNamesConstants.Login 的内容，我可以这样做

var parameters = new Dictionary<object, object> {
  ParameterNamesConstants.Method, "Google" }
};
Analytics.LogEvent(EventNamesConstants.Login, parameters);

但现在我需要登录

EventNamesConstants.ViewItem

参数之一是项目数组，其中项目有名称。 当我尝试做类似的事情时

var items = new[]{
new Dictionary<object, object> {
ParameterNamesConstants.ItemName, title }
     }
 };
 
 var parameters = new Dictionary<object, object> {
   ParameterNamesConstants.Currency, currencyCode },
   ParameterNamesConstants.Value, value },
   ParameterNamesConstants.Items, items }
 };

我收到一个错误。 我试图找到示例，但他们没有数组。 非常抱歉。

错误是：

不知道如何封送类型的对象

 'System.Collections.Generic.Dictionary`2[System.Object,System.Object][]'
 to an NSObject

Firebase 的 func Analytics.LogEvent 是：

public static void LogEvent (string name, Dictionary<object, object>? parameters) 
{   
 LogEvent (name, (parameters == null) ? null :
 ((parameters!.Keys.Count == 0) ? new NSDictionary<NSString, NSObject>
 () : NSDictionary<NSString, NSObject>.FromObjectsAndKeys
 (parameters!.Values.ToArray (), parameters!.Keys.ToArray (),
 nint.op_Implicit (parameters!.Keys.Count)))); 
}

请帮助我。

Answer 1

作为解决方法，您可以尝试以下方法来创建参数，

var keys = new[]
{
    new NSString("key1"),
    new NSString("key2"),
};

var objects = new NSObject[]
{ 
    new NSString("object1"),
    new NSString("object1"),
};

NSDictionary dicionary = new NSDictionary<NSString, NSObject>(keys, objects);

NSArray items =  NSArray.FromNSObjects(dicionary);

var parameters = new Dictionary<object, object>
{
    { ParameterNamesConstants.Currency, currencyCode },
    { ParameterNamesConstants.Value, value },
    { ParameterNamesConstants.Items, items }
};

Answer 2

我还在我的应用中使用 Firebase Analytics。

这是

IDictionary<string, string>

上合适的扩展方法，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);
}

如果您需要，这里还有一份

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);
}

仅供参考：我使用

ArgumentNullException.ThrowIfNull

=> 仅自 C#10 起可用，如果您在 C#10 下，请使用经典方法。