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Read information from a dictionary [closed]

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How can I read information from a dictionary to a text box?
var cities = new Dictionary<int, string>
{
{ 10, "New York" },
};
textBox1.Text = cities.Values[1];

Try instead to use the index that you created on the dictionary:
var cities = new Dictionary<int, string>
{
{ 10, "New York" },
};
textBox1.Text = cities[10];

Which way is better to map a string array and null check? [closed]

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What is the best way to map the result of adds to Codes?
result.adds contains a string array:
string[] adds = new string[] { "A", "B", "C" };
Option 1:
var car = new Car()
{
Name = request.Name,
Codes = (result.adds != null) ? adds : new string[] { }
};
In my opinion option 1 seems strange with creating a new empty string array when the result is false. I also have my doubts about mapping within the object mapping itself. On the other hand, it's direct and fast.
Option 2:
if (result.adds != null)
{
adds = results.adds;
}
var car = new Car()
{
Name = request.Name,
Codes = adds
};
Option 2 null check seems overkill to define the code seperately. It could simply be included in the mapper.

Of the two options you've presented option #1 looks the cleanest. However, you can simplify it more if you can use the null coalescing operator:
var car = new Car()
{
Name = request.Name,
Codes = result.adds ?? Array.Empty<string>()
};
This will use an empty string array in results.add is null.

Ways to parse Json recursive [closed]

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My problem is that I need to parse json to another json format, I need to do that recursive. I have been tried diferents way but any works fine for me.
I would like to know more ways for test.
Thanks!
{
"items": {
"itemName": {
"type": "type",
"properties": {
"item1": {
"type": 1,
"isValid": true
},
"item2": {
"type": 1,
"isValid": true
}
}
}
}
}
And I need to make this
{
"items":{
"item1": 1,
"item2": 1
}
}

You can try with JToken to read the JSON and JsonConvert to convert the object to desired JSON
using (StreamReader r = new StreamReader(filepath))
{
var inputString = r.ReadToEnd();
JToken outer = JToken.Parse(inputString);
JObject inner = outer["items"]["itemName"]["properties"].Value<JObject>();
List<string> keys = inner.Properties().Select(p => p.Name).ToList();
var items = new ExpandoObject() as IDictionary<string, Object>;
foreach (string k in keys)
{
items.Add(k, Convert.ToInt32(outer["items"]["itemName"]["properties"][k]["type"]));
}
Console.WriteLine(JsonConvert.SerializeObject(new { items = items }));
}
output
{"items":{"item1":1,"item2":2}}

Parse JSON using Newtonsoft.Json C# [closed]

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I have the following json string:
{
"data":
{
"id": "1",
"city": "London"
},
"cityDetails":
{
"_id": "1",
"location": "UK",
"th": 0,
"title": "Default Group",
}
},
"limit": 0.60451203584671021,
"_id": "1234"
}
How can I extract the the 'city' name from the 'data' section of the JSON string using Newtonsoft.Json in C#.

Try
// load your json here
var obj = JObject.Parse(#"{
""data"":
{
""id"": ""1"",
""city"": ""London""
},
""_id"": ""1234""
}");
// get the city
var city = (string)obj.SelectToken("data.city");
You need to update the selected-token path if the JSON you provided is part of/inside another.

How to run any mongodb query from C# [closed]

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I want to run this mongodb query from C#:
db.Stories.find({_id: ObjectId("52318492c28f7c19d4270c7f")},
{Chapter:
{$elemMatch:{
ChapId:ObjectId("52318629c28f7c1ec4515000")
}}
})

Try to make something like this:
var server = MongoServer.Create("mongodb://localhost:27020");
var database = server.GetDatabase("someDb");
var collection = database.GetCollection<Type>("someCollection");
var searchQuery = Query.GT("myfield", 10).LT(20);
var list = collection.Find(searchQuery);
Reference: MongoDB C# Query expression (How to?)

What does Query.GT mean
My collection like this
And i want to get The chapcontent in a chapter by chapid
"AuthorName" : "From",
"CateName" : "biết chết liền",
"Chapter" : [
{
"ChapContent" : [
{
"ImgUrL" : "../Upload/Stories/523675fec28f7c04b088afd6/52367611c28f7c04b088afd7/12613_617411151612439_796025785_n.jpg",
"Page" : 1,
"PageId" : ObjectId("52367612c28f7c04b088afd8")
},
{
"ImgUrL" : "../Upload/Stories/523675fec28f7c04b088afd6/52367611c28f7c04b088afd7/21453_617411254945762_2771189_n.jpg",
"Page" : 1,
"PageId" : ObjectId("52367612c28f7c04b088afd9")
},
"DatePost" : ISODate("2013-09-16T03:07:42.096Z"),
"Description" : "dsngdsfhgdsjhfgds",
"FirstCharacter" : "b",
"LastModify" : ISODate("2013-09-16T03:07:42.096Z"),
"Status" : 1,
"StoryName" : "biết ai",
"Title" : "ai biêt",
"_id" : ObjectId("523675fec28f7c04b088afd6")