Xamarin.iOS，将 Dictionary 转换为 NSDictionary

Posted 2023-02-23

【中文标题】Xamarin.iOS，将 Dictionary 转换为 NSDictionary

【英文标题】：Xamarin.iOS, convert Dictionary to NSDictionary

【发布时间】：2016-07-01 20:27:52

【问题描述】：

我正在尝试将 Branch.io 集成到我的 Xamarin 项目中，并且遇到了将 c# 的 Dictionary 转换为 NSDictionary 的要求。

试过

字典作为 NSDictionary //没用

也试过了

private NSMutableDictionary BranchData (Dictionary<string, object> data)
        
            List<string> keys = data.Keys.ToList();
            NSMutableDictionary branchData = new NSMutableDictionary ();

            foreach (string key in keys) 
                branchData.Add (new NSString(key), data[key] as NSObject);
            
            return branchData;
        

没用。

任何线索都会有所帮助。谢谢！

更新：

https://***.com/a/5664785/344798

【参考方案1】：

这就是我将字典转换为 NSDictionary 的方式

var iconattrs = new Dictionary<string, string>
                
                    "ITEMTYPE", "DIVESITE",
                    "LOCATION", diveSite.Location,
                    "DESCRIPTION", diveSite.BriefDescription,
                    "LINK", diveSite.Link,
                    "ID", diveSite.ID.ToString()
                ;

 var myResult = NSDictionary.FromObjectsAndKeys(iconattrs.Values.ToArray()
                                               ,iconattrs.Keys.ToArray())

【讨论】：

嗨，我怎样才能把它倒过来？我的意思是 NSDictionary 到 Dictionary

【参考方案2】：

这对我有用..当然可以优化或者更智能：

private static NSMutableDictionary ConvertToNativeDictionary(Dictionary<string, object> dict)

    NSMutableDictionary newDictionary = new NSMutableDictionary();

    try
    
        foreach (string k in dict.Keys)
        
            var value = dict[k];

            try
            
                if (value is string)
                    newDictionary.Add((NSString)k, new NSString((string)value));
                else if (value is int)
                    newDictionary.Add((NSString)k, new NSNumber((int)value));
                else if (value is float)
                    newDictionary.Add((NSString)k, new NSNumber((float)value));
                else if (value is nfloat)
                    newDictionary.Add((NSString)k, new NSNumber((nfloat)value));
                else if (value is double)
                    newDictionary.Add((NSString)k, new NSNumber((double)value));
                else if (value is bool)
                    newDictionary.Add((NSString)k, new NSNumber((bool)value));
                else if (value is DateTime)
                    newDictionary.Add((NSString)k, ((DateTime)value).DateTimeToNSDate());
                else
                    newDictionary.Add((NSString)k, new NSString(value.ToString()));
            
            catch (Exception Ex)
            
                if (value != null)
                    Ex.Data.Add("value", value);

                Logger.LogException(Ex);
                continue;
            
        
    
    catch (Exception Ex)
    
        Logger.LogException(Ex);
    
    return newDictionary;

这是 NSDate 转换：

public static class NSDateExtensions

    public static DateTime NSDateToDateTime(this NSDate date)
    
        DateTime reference = TimeZone.CurrentTimeZone.ToLocalTime(
            new DateTime(2001, 1, 1, 0, 0, 0));
        return reference.AddSeconds(date.SecondsSinceReferenceDate);
    

    public static NSDate DateTimeToNSDate(this DateTime date)
    
        DateTime reference = TimeZone.CurrentTimeZone.ToLocalTime(
            new DateTime(2001, 1, 1, 0, 0, 0));
        return NSDate.FromTimeIntervalSinceReferenceDate(
            (date - reference).TotalSeconds);