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ML.net cant find input column, out of range exception when training algorithm

I'm new with the ML.NET and have a problem which i cannot resolve for few days.
I can train my model, but when i try to CreateEnginePrediciton, i have an error: "Feature column 'Feature' not found"
Here is my code:
var context = new MLContext(seed: 0);
// Create a DataView containing the image paths and labels
var input = LoadLabeledImagesFromPath(_imagePath);
var data = context.Data.LoadFromEnumerable(input);
data = context.Data.ShuffleRows(data);
// Load the images and convert the labels to keys to serve as categorical values
var images = context.Transforms.Conversion.MapValueToKey(inputColumnName: nameof(Input.Label), outputColumnName: _keyColumnName)
.Append(context.Transforms.LoadRawImageBytes(inputColumnName: nameof(Input.ImagePath), outputColumnName: nameof(Input.Image), imageFolder: _imagePath));
var dataPrepModel = images.Fit(data);
var dataPrepDataView = dataPrepModel.Transform(data);
// Split the dataset for training and testing
var trainTestData = context.Data.TrainTestSplit(dataPrepDataView, testFraction: 0.2, seed: 1);
var trainData = trainTestData.TrainSet;
var testData = trainTestData.TestSet;
// Create an image-classification pipeline and train the model
var options = new ImageClassificationTrainer.Options()
{
FeatureColumnName = nameof(Input.Image),
LabelColumnName = _keyColumnName,
ValidationSet = testData,
Arch = ImageClassificationTrainer.Architecture.ResnetV2101, // Pretrained DNN
MetricsCallback = (metrics) => Console.WriteLine(metrics),
TestOnTrainSet = false
};
var pipeline = context.MulticlassClassification.Trainers.ImageClassification(options)
.Append(context.Transforms.Conversion.MapKeyToValue(_predictedLabelColumnName));
Console.WriteLine("Training the model...");
var model = pipeline.Fit(trainData);
// Evaluate the model and show the results
var predictions = model.Transform(trainData);
var metrics = context.MulticlassClassification.Evaluate(predictions, labelColumnName: _keyColumnName, predictedLabelColumnName: _predictedLabelColumnName);
Console.WriteLine();
Console.WriteLine($"Macro accuracy = {metrics.MacroAccuracy:P2}");
Console.WriteLine($"Micro accuracy = {metrics.MicroAccuracy:P2}");
Console.WriteLine(metrics.ConfusionMatrix.GetFormattedConfusionTable());
Console.WriteLine();
// Save the model
Console.WriteLine();
Console.WriteLine("Saving the model...");
context.Model.Save(model, trainData.Schema, _savePath);
}
private static List<Input> LoadLabeledImagesFromPath(string path)
{
var images = new List<Input>();
var directories = Directory.EnumerateDirectories(path);
foreach (var directory in directories)
{
var files = Directory.EnumerateFiles(directory);
images.AddRange(files.Select(x => new Input
{
ImagePath = Path.GetFullPath(x),
Label = Path.GetFileName(directory)
}));
}
return images;
And my classess:
public class Input
{
public byte[] Image;
public string ImagePath;
public string Label;
}
public class Output
{
public float[] Score;
public string PredictedLabel;
}
And code where i try to create prediciton engine:
public static PredictionEngine<ModelInput, ModelOutput> CreatePredictionEngine()
{
// Create new MLContext
MLContext mlContext = new MLContext();
// Load model & create prediction engine
ITransformer mlModel = mlContext.Model.Load(MLNetModelPath, out var modelInputSchema);
var predEngine = mlContext.Model.CreatePredictionEngine<ModelInput, ModelOutput>(mlModel);
return predEngine;
}
Could you help me? Code is mostly from ML.NET tutorials and i can train it but cannot use it :-(

Importing excel file with all the conditional formatting rules to epplus

I have an excel file which contains lots of data along with icon sets and data bars based on the values in the cell. It looks like this:
I want to import this excel sheet along with the conditional formatting. Is there any library for this?? I went through this http://www.sitecorecleveland.com/resources/blogs-posts/easy_excel_interaction_pt6 but it only imports data not format.
If that's not possible is there code in epplus to have these iconsets in excel sheet. I can have arrows, traffic lights, etc but not these.

I dont think EPP supports custom conditional formatting which are stored as "Workbook Extensions" in the xml of the Excel file. You could copy the xml node of the "extLst" which contains the custom formatting from one worksheet to another. Just make sure there is nothing else beside the cond formatting xml in the node that you do not want copied in which case you will have to select only the child nodes you want.
To test, i created the following excel sheet (temp.xlsx), did a copy.paste of values only and saved to a new file (temp2.xlsx):
Then ran the following and it successfully copied the formatting over:
public void Custom_Condition_Copy_Test()
{
//http://stackoverflow.com/questions/28493050/importing-excel-file-with-all-the-conditional-formatting-rules-to-epplus
//File with custom conditional formatting
var existingFile = new FileInfo(#"c:\temp\temp.xlsx");
//Copy of the file with the conditonal formatting removed
var existingFile2 = new FileInfo(#"c:\temp\temp2.xlsx");
using (var package = new ExcelPackage(existingFile))
using (var package2 = new ExcelPackage(existingFile2))
{
//Make sure there are document element for the source
var worksheet = package.Workbook.Worksheets.First();
var xdoc = worksheet.WorksheetXml;
if (xdoc.DocumentElement == null)
return;
//Make sure there are document element for the destination
var worksheet2 = package2.Workbook.Worksheets.First();
var xdoc2 = worksheet2.WorksheetXml;
if (xdoc2.DocumentElement == null)
return;
//get the extension list node 'extLst' from the ws with the formatting
var extensionlistnode = xdoc
.DocumentElement
.GetElementsByTagName("extLst")[0];
//Create the import node and append it to the end of the xml document
var newnode = xdoc2.ImportNode(extensionlistnode, true);
xdoc2.LastChild.AppendChild(newnode);
package2.Save();
}
}
Might want to put some try's in there but this should get you close.
UPDATE: Based on OPs comment.
If you want to be able to add the custom conditional format without the need of the original file that contains it, I see two options.
Option 1, you do it the more "correct" way and use the DocumentFormat.OpenXml namespace. BUT, this would require you to have the Office Open XML library available which may or may not be so easy depending on the environment you are running this in. You can get it from here http://www.microsoft.com/en-us/download/details.aspx?id=30425 and it comes with a Reflection tool that can generate the code you want which gets you this:
using DocumentFormat.OpenXml.Packaging;
using DocumentFormat.OpenXml.Spreadsheet;
using DocumentFormat.OpenXml;
using X14 = DocumentFormat.OpenXml.Office2010.Excel;
using Excel = DocumentFormat.OpenXml.Office.Excel;
......
WorksheetExtensionList worksheetExtensionList1 = new WorksheetExtensionList();
WorksheetExtension worksheetExtension1 = new WorksheetExtension(){ Uri = "{78C0D931-6437-407d-A8EE-F0AAD7539E65}" };
worksheetExtension1.AddNamespaceDeclaration("x14", "http://schemas.microsoft.com/office/spreadsheetml/2009/9/main");
X14.ConditionalFormattings conditionalFormattings1 = new X14.ConditionalFormattings();
X14.ConditionalFormatting conditionalFormatting1 = new X14.ConditionalFormatting();
conditionalFormatting1.AddNamespaceDeclaration("xm", "http://schemas.microsoft.com/office/excel/2006/main");
X14.ConditionalFormattingRule conditionalFormattingRule1 = new X14.ConditionalFormattingRule(){ Type = ConditionalFormatValues.IconSet, Priority = 2, Id = "{CD6B2710-0474-449D-881A-22CFE15D011D}" };
X14.IconSet iconSet1 = new X14.IconSet(){ IconSetTypes = X14.IconSetTypeValues.FiveArrows, Custom = true };
X14.ConditionalFormattingValueObject conditionalFormattingValueObject1 = new X14.ConditionalFormattingValueObject(){ Type = X14.ConditionalFormattingValueObjectTypeValues.Percent };
Excel.Formula formula1 = new Excel.Formula();
formula1.Text = "0";
conditionalFormattingValueObject1.Append(formula1);
X14.ConditionalFormattingValueObject conditionalFormattingValueObject2 = new X14.ConditionalFormattingValueObject(){ Type = X14.ConditionalFormattingValueObjectTypeValues.Percent };
Excel.Formula formula2 = new Excel.Formula();
formula2.Text = "20";
conditionalFormattingValueObject2.Append(formula2);
X14.ConditionalFormattingValueObject conditionalFormattingValueObject3 = new X14.ConditionalFormattingValueObject(){ Type = X14.ConditionalFormattingValueObjectTypeValues.Percent };
Excel.Formula formula3 = new Excel.Formula();
formula3.Text = "40";
conditionalFormattingValueObject3.Append(formula3);
X14.ConditionalFormattingValueObject conditionalFormattingValueObject4 = new X14.ConditionalFormattingValueObject(){ Type = X14.ConditionalFormattingValueObjectTypeValues.Percent };
Excel.Formula formula4 = new Excel.Formula();
formula4.Text = "60";
conditionalFormattingValueObject4.Append(formula4);
X14.ConditionalFormattingValueObject conditionalFormattingValueObject5 = new X14.ConditionalFormattingValueObject(){ Type = X14.ConditionalFormattingValueObjectTypeValues.Percent };
Excel.Formula formula5 = new Excel.Formula();
formula5.Text = "80";
conditionalFormattingValueObject5.Append(formula5);
X14.ConditionalFormattingIcon conditionalFormattingIcon1 = new X14.ConditionalFormattingIcon(){ IconSet = X14.IconSetTypeValues.ThreeSymbols, IconId = (UInt32Value)0U };
X14.ConditionalFormattingIcon conditionalFormattingIcon2 = new X14.ConditionalFormattingIcon(){ IconSet = X14.IconSetTypeValues.ThreeTrafficLights1, IconId = (UInt32Value)0U };
X14.ConditionalFormattingIcon conditionalFormattingIcon3 = new X14.ConditionalFormattingIcon(){ IconSet = X14.IconSetTypeValues.ThreeTriangles, IconId = (UInt32Value)0U };
X14.ConditionalFormattingIcon conditionalFormattingIcon4 = new X14.ConditionalFormattingIcon(){ IconSet = X14.IconSetTypeValues.ThreeTriangles, IconId = (UInt32Value)1U };
X14.ConditionalFormattingIcon conditionalFormattingIcon5 = new X14.ConditionalFormattingIcon(){ IconSet = X14.IconSetTypeValues.ThreeTriangles, IconId = (UInt32Value)2U };
iconSet1.Append(conditionalFormattingValueObject1);
iconSet1.Append(conditionalFormattingValueObject2);
iconSet1.Append(conditionalFormattingValueObject3);
iconSet1.Append(conditionalFormattingValueObject4);
iconSet1.Append(conditionalFormattingValueObject5);
iconSet1.Append(conditionalFormattingIcon1);
iconSet1.Append(conditionalFormattingIcon2);
iconSet1.Append(conditionalFormattingIcon3);
iconSet1.Append(conditionalFormattingIcon4);
iconSet1.Append(conditionalFormattingIcon5);
conditionalFormattingRule1.Append(iconSet1);
Excel.ReferenceSequence referenceSequence1 = new Excel.ReferenceSequence();
referenceSequence1.Text = "A1:C201";
conditionalFormatting1.Append(conditionalFormattingRule1);
conditionalFormatting1.Append(referenceSequence1);
conditionalFormattings1.Append(conditionalFormatting1);
worksheetExtension1.Append(conditionalFormattings1);
worksheetExtensionList1.Append(worksheetExtension1);
....
worksheet1.Append(worksheetExtensionList1);
Option 2 would be to do as you are asking and perform string manipulation. This is much easier but it is a slightly dirty in that you are messing with strings rather then objects but if the only thing you need to set is the cell range that doesnt seem so bad. I used the test method above to extract the string with = extensionlistnode.OuterXml:
[TestMethod]
public void Custom_Condition_From_String_Test()
{
//http://stackoverflow.com/questions/28493050/importing-excel-file-with-all-the-conditional-formatting-rules-to-epplus
//Throw in some data
var datatable = new DataTable("tblData");
datatable.Columns.Add(new DataColumn("Col1", typeof(int)));
datatable.Columns.Add(new DataColumn("Col2", typeof(int)));
datatable.Columns.Add(new DataColumn("Col3", typeof(int)));
for (var i = 0; i < 20; i++)
{
var row = datatable.NewRow();
row["Col1"] = i;
row["Col2"] = i * 10;
row["Col3"] = i * 100;
datatable.Rows.Add(row);
}
//Copy of the file with the conditonal formatting removed
var existingFile2 = new FileInfo(#"c:\temp\temp2.xlsx");
if (existingFile2.Exists)
existingFile2.Delete();
using (var package2 = new ExcelPackage(existingFile2))
{
//Add the data
var ws = package2.Workbook.Worksheets.Add("Content");
ws.Cells.LoadFromDataTable(datatable, true);
//The XML String extracted from the orginal excel doc using '= extensionlistnode.OuterXml'
var cellrange = "A1:C201";
var rawxml = String.Format(
"<extLst xmlns=\"http://schemas.openxmlformats.org/spreadsheetml/2006/main\"><ext uri=\"{{78C0D931-6437-407d-A8EE-F0AAD7539E65}}\" xmlns:x14=\"http://schemas.microsoft.com/office/spreadsheetml/2009/9/main\"><x14:conditionalFormattings><x14:conditionalFormatting xmlns:xm=\"http://schemas.microsoft.com/office/excel/2006/main\"><x14:cfRule type=\"iconSet\" priority=\"2\" id=\"{{CD6B2710-0474-449D-881A-22CFE15D011D}}\"><x14:iconSet iconSet=\"5Arrows\" custom=\"1\"><x14:cfvo type=\"percent\"><xm:f>0</xm:f></x14:cfvo><x14:cfvo type=\"percent\"><xm:f>20</xm:f></x14:cfvo><x14:cfvo type=\"percent\"><xm:f>40</xm:f></x14:cfvo><x14:cfvo type=\"percent\"><xm:f>60</xm:f></x14:cfvo><x14:cfvo type=\"percent\"><xm:f>80</xm:f></x14:cfvo><x14:cfIcon iconSet=\"3Symbols\" iconId=\"0\" /><x14:cfIcon iconSet=\"3TrafficLights1\" iconId=\"0\" /><x14:cfIcon iconSet=\"3Triangles\" iconId=\"0\" /><x14:cfIcon iconSet=\"3Triangles\" iconId=\"1\" /><x14:cfIcon iconSet=\"3Triangles\" iconId=\"2\" /></x14:iconSet></x14:cfRule><xm:sqref>{0}</xm:sqref></x14:conditionalFormatting></x14:conditionalFormattings></ext></extLst>"
, cellrange);
var newxdoc = new XmlDocument();
newxdoc.LoadXml(rawxml);
//Create the import node and append it to the end of the xml document
var xdoc2 = ws.WorksheetXml;
var newnode = xdoc2.ImportNode(newxdoc.FirstChild, true);
xdoc2.LastChild.AppendChild(newnode);
package2.Save();
}
}

Export Datatable to Word Document With Page Numbers using Open XML

My requirement is : Exporting a dynamic DataTable to Word document with Page Numbers
We need to use Open XML to achieve this.
I have code to export Datatable to Word. And also to insert page numbers.
I got Below code code to export datatable
public void CreateWordtable(string filename,DataTable data)
{
WordprocessingDocument doc = WordprocessingDocument.Create(filename, WordprocessingDocumentType.Document);
MainDocumentPart mainDocPart = doc.AddMainDocumentPart();
mainDocPart.Document = new Document();
Body body = new Body();
mainDocPart.Document.Append(body);
//rinks#::creating new table
DocumentFormat.OpenXml.Wordprocessing.Table table = new DocumentFormat.OpenXml.Wordprocessing.Table();
for (int i = 0; i < data.Rows.Count; ++i)
{
TableRow row = new TableRow();
for (int j = 0; j < data.Columns.Count; j++)
{
TableCell cell = new TableCell();
cell.Append(new Paragraph(new DocumentFormat.OpenXml.Wordprocessing.Run(new DocumentFormat.OpenXml.Wordprocessing.Text(data.Rows[i][j].ToString()))));
cell.Append(new TableCellProperties(new TableCellWidth { Type = TableWidthUnitValues.Dxa, Width = "1200" }));
row.Append(cell);
}
table.Append(row);
}
body.Append(table);
doc.MainDocumentPart.Document.Save();
doc.Dispose();
}
And below code is to insert page numbers in a word document
private static void AddPageNumberFooters(WordprocessingDocument parent)
{
string documentPath = #"D:\EmptyDoc.docx";
using (WordprocessingDocument package =
WordprocessingDocument.Open(documentPath, true))
{
var mainDocumentPart = parent.AddMainDocumentPart();
GenerateMainDocumentPart().Save(mainDocumentPart);
var documentSettingsPart =
mainDocumentPart.AddNewPart
<DocumentSettingsPart>("rId1");
GenerateDocumentSettingsPart().Save(documentSettingsPart);
var firstPageFooterPart = mainDocumentPart.AddNewPart<FooterPart>("rId1");
GeneratePageFooterPart("Page 1 of 2").Save(firstPageFooterPart);
var secondPageFooterPart = mainDocumentPart.AddNewPart<FooterPart>("rId2");
GeneratePageFooterPart("Page 2 of 2").Save(secondPageFooterPart);
}
}
private static Document GenerateMainDocumentPart()
{
var element =
new Document(
new Body(
new Paragraph(
new Run(
new Text("Page 1 content"))
),
new Paragraph(
new Run(
new Break() { Type = BreakValues.Page })
),
new Paragraph(
new Run(
new LastRenderedPageBreak(),
new Text("Page 2 content"))
),
new Paragraph(
new Run(
new Break() { Type = BreakValues.Page })
),
new SectionProperties(
new FooterReference()
{
Type = HeaderFooterValues.First,
Id = "rId1"
},
new FooterReference()
{
Type = HeaderFooterValues.Even,
Id = "rId2"
},
new PageMargin()
{
Top = 1440,
Right = (UInt32Value)1440UL,
Bottom = 1440,
Left = (UInt32Value)1440UL,
Header = (UInt32Value)720UL,
Footer = (UInt32Value)720UL,
Gutter = (UInt32Value)0UL
},
new TitlePage()
)));
return element;
}
private static Header GeneratePageHeaderPart(string HeaderText)
{
var element =
new Header(
new Paragraph(
new ParagraphProperties(
new ParagraphStyleId() { Val = "Header" }),
new Run(
new Text(HeaderText))
));
return element;
}
My problem is, I have combine above both methods to export data along with page numbers.
if we know there are 2 pages in the word document, i can insert 2 FooterParts.
But i don't know how many pages will be created after exporting the data.

try the following code to automatically add page numbers:
private static string GenerateFooterPartContent(WordprocessingDocument package, string text = null)
{
FooterPart footerPart1 = package.MainDocumentPart.FooterParts.FirstOrDefault();
if (footerPart1 == null)
{
footerPart1 = package.MainDocumentPart.AddNewPart<FooterPart>();
}
var relationshipId = package.MainDocumentPart.GetIdOfPart(footerPart1);
// Get SectionProperties and set HeaderReference and FooterRefernce with new Id
SectionProperties sectionProperties1 = new SectionProperties();
FooterReference footerReference2 = new FooterReference() { Type = HeaderFooterValues.Default, Id = relationshipId };
sectionProperties1.Append(footerReference2);
package.MainDocumentPart.Document.Body.Append(sectionProperties1);
Footer footer1 = new Footer();
var r = new Run();
PositionalTab positionalTab2 = new PositionalTab() { Alignment = AbsolutePositionTabAlignmentValues.Right,
RelativeTo = AbsolutePositionTabPositioningBaseValues.Margin,
Leader = AbsolutePositionTabLeaderCharValues.None };
r.Append(positionalTab2);
paragraph2.Append(r);
r = new Run(new Text("Page: ") { Space = SpaceProcessingModeValues.Preserve },
// *** Adaptation: This will output the page number dynamically ***
new SimpleField() { Instruction = "PAGE" },
new Text(" of ") { Space = SpaceProcessingModeValues.Preserve },
// *** Adaptation: This will output the number of pages dynamically ***
new SimpleField() { Instruction = "NUMPAGES" });
paragraph2.Append(r);
footer1.Append(paragraph2);
footerPart1.Footer = footer1;
return relationshipId;
}

Xamarin - Video Cropping for iOS

I was wondering if there was a way to crop videos in Xamarin. I can't seem to find any examples. I tried looking at the existing functions and Classes but I couldn't find anything.
Basically make square videos like what Vine and Instagram have. I think this is done by cropping out the rest of the video and not just zooming in.

I find part of the code from one source, I tried to add owner but I could not find. The solution's key part is added by me for cropping which is "VideoCleanAperture" inside AVVideoSettingsCompressed.
videoUrl = ((AVFoundation.AVUrlAsset)avAsset).Url;
NSError assetReaderError;
var assetReader = AVAssetReader.FromAsset(avAsset, out assetReaderError);
var assetTrack = avAsset.Tracks.First();
//Height = (System.nint?)avAsset.NaturalSize.Height,
//Width = (System.nint?)avAsset.NaturalSize.Width,
var inputSettings = new AVVideoSettingsUncompressed()
{
Height = (System.nint?)avAsset.NaturalSize.Height,
Width = (System.nint?)avAsset.NaturalSize.Width,
};
var assetReaderOutput = new AVAssetReaderTrackOutput(assetTrack, settings: inputSettings);
assetReaderOutput.AlwaysCopiesSampleData = false;
string tempFile = Path.Combine(Path.GetTempPath(), "CroppedVideo.mp4");
if (File.Exists(tempFile)) File.Delete(tempFile);
var url = NSUrl.FromFilename(tempFile);
NSError assetWriterError;
var assetWriter = new AVAssetWriter(url, AVFileType.Mpeg4, out assetWriterError);
var outputSettings = new AVVideoSettingsCompressed()
{
Height = 300,
Width = 300,
Codec = AVVideoCodec.H264,
CodecSettings = new AVVideoCodecSettings()
{
AverageBitRate = 1000000,
VideoCleanAperture = new AVVideoCleanApertureSettings(
new NSDictionary(
AVVideo.CleanApertureWidthKey, new NSNumber(300),
AVVideo.CleanApertureHeightKey, new NSNumber(300),
AVVideo.CleanApertureVerticalOffsetKey, new NSNumber(10),
AVVideo.CleanApertureHorizontalOffsetKey, new NSNumber(10)
)
)
},
ScalingMode = AVVideoScalingMode.ResizeAspectFill
};
var assetWriterInput = new AVAssetWriterInput(mediaType: AVMediaType.Video, outputSettings: outputSettings);
assetWriterInput.ExpectsMediaDataInRealTime = false;
assetWriter.AddInput(assetWriterInput);
assetWriter.StartWriting();
assetReader.AddOutput(assetReaderOutput);
assetReader.StartReading();
assetWriter.StartSessionAtSourceTime(CoreMedia.CMTime.Zero);
var mediaInputQueue = new DispatchQueue("mediaInputQueue");
assetWriterInput.RequestMediaData(mediaInputQueue, () =>
{
while (assetWriterInput.ReadyForMoreMediaData)
{
var nextBuffer = assetReaderOutput.CopyNextSampleBuffer();
if (nextBuffer != null)
{
assetWriterInput.AppendSampleBuffer(nextBuffer);
}
else
{
assetWriterInput.MarkAsFinished();
assetWriter.FinishWritingAsync();
assetReader.CancelReading();
assetReader.Dispose();
assetReaderOutput.Dispose();
assetWriter.Dispose();
assetWriterInput.Dispose();
break;
}
}
});
}

MongoDB + C#: Query inside a document

It seems I don't understand how I can get a value from a collection inside a document. I am using mongoDB in C#.
Here is my code:
var jimi = new Document();
jimi["Firstname"] = "Jimi";
jimi["Lastname"] = "James";
jimi["Pets"] = new[]
{
new Document().Append("Type", "Cat").Append("Name", "Fluffy"),
new Document().Append("Type", "Dog").Append("Name", "Barky"),
new Document().Append("Type", "Gorilla").Append("Name", "Bananas"),
};
test.Insert(jimi);
var query = new Document().Append("Pets.Type","Cat");
So my query will look for the pet cat. But I am not sure how I can get the name of my cat. I tried a few things but I mostly get the whole document back.
Thanks in advance,
Pickels

This isn't as elegant as I'd like as I'm still learning about MongoDB myself but it does show you one way to get the property you wanted.
[TestFixture]
public class When_working_with_nested_documents
{
[Test]
public void Should_be_able_to_fetch_properties_of_nested_objects()
{
var mongo = new Mongo();
mongo.Connect();
var db = mongo.getDB("tests");
var people = db.GetCollection("people");
var jimi = new Document();
jimi["Firstname"] = "Jimi";
jimi["Lastname"] = "James";
jimi["Pets"] = new[]
{
new Document().Append("Type", "Cat").Append("Name", "Fluffy"),
new Document().Append("Type", "Dog").Append("Name", "Barky"),
new Document().Append("Type", "Gorilla").Append("Name", "Bananas"),
};
people.Insert(jimi);
var query = new Document();
query["Pets.Type"] = "Cat";
var personResult = people.FindOne(query);
Assert.IsNotNull(personResult);
var petsResult = (Document[])personResult["Pets"];
var pet = petsResult.FindOne("Type", "Cat");
Assert.IsNotNull(pet);
Assert.AreEqual("Fluffy", pet["Name"]);
}
}
public static class DocumentExtensions
{
public static Document FindOne(this Document[] documents, string key, string value)
{
foreach(var document in documents)
{
var v = document[key];
if (v != null && v.Equals(value))
{
return document;
}
}
return null;
}
}