Literal Improvement in C# 7.0

C# 7.0 now allows using underscore _ to be used a digit separator.

This adds more readability.

Similarly, we now have Binary Literals, so instead of specifying hexadecimal pattern we can specify bit patterns.

Hope it helps..

Using Out Variables (C# 7.0) instead of Out Parameters

Out Parameters must need to declared before they are used in the method which doesn’t seem intuitive.

Now with C# 7.0 we can now make use of Out variable.

Here in our second call to the method we have used out variable named outVariableString which we didn’t have to declare like output parameter.

Hope it helps..

Tuple Types and Tuple Literals in C# 7.0

Tuple are used when we need to get more than one value returned from the method.

C# 7.0 introduces Tuple Types and Tuple Literals to Tuples

We need to add System.ValueType Nuget Package to add the required assemblies to Visual Studio.

Below sample code shows usage of Tuple type and literal. In our second method, we have named the part of the tuple i.e. name and number.

Now to access the first method we use Item1 and Item2 field, however for our second method as we have named the part we can use those names to access them i.e. name and number.

Output in both the case

Hope it helps..

New Feature – Local Functions in C# 7.0

C# 7.0 adds a new feature called local functions.

Local functions allow us to define function within a function. It can be used to write helper methods that we need to use inside that function’s scope.

Here in the below sample code we have defined one main function (MainFunction) that has one local function(MultiplyBy10LocalFunction) defined inside it. And that local function has one more local function(Add10LocalFunction) defined inside it.

Hope it helps..

Step by step – Upload files to Azure Blob storage

Here we will be creating a storage account of type blob storage and a container inside it. Then we will create a console application, add required nuget packages and upload a file to the container.

Log in to Azure Portal

https://portal.azure.com

Click on Add to add a new storage account.

Create a new container in it to store the blob files

Now we’d write a console app to connect to this container and upload a file.

Create a new console application and add references to below Nuget Packages.

  • Windows.Azure.Storage
  • Windows.Azure.ConfigurationManager

In Azure Portal – Storage Account, go to Access Keys and copy the connection strings for the storage account.

Inside console application add an appSettings section and add a key and paste the above copied connection string there.

The source code to upload the Blob file

// Retrieve storage account from connection string.
CloudStorageAccount storageAccount = CloudStorageAccount.Parse(
CloudConfigurationManager.GetSetting("StorageConnectionString"));

// Create the blob client.
CloudBlobClient blobClient = storageAccount.CreateCloudBlobClient();

// Retrieve a reference to a container.
CloudBlobContainer container = blobClient.GetContainerReference("myblogcontainer");

// Retrieve reference to a blob named "myblob".
CloudBlockBlob blockBlob = container.GetBlockBlobReference("WeekendChamps.jpg");

// Create or overwrite the "myblob" blob with contents from a local file.
using (var fileStream = System.IO.File.OpenRead(@"C:\Users\Bliss\Downloads\WeekendChamps.jpg"))
{
blockBlob.UploadFromStream(fileStream);
}

The file uploaded in the container

Hope it helps..

Insert a Chart in Excel Spreadsheet using EPPlus Library.

EPPlus is .NET Library that makes it very easy to manipulate Excel programmatically. It is based on Open XML.

https://epplus.codeplex.com/

Below is the sample code we can use to insert a chart in a excel spreadsheet.


public void UpdateExcelUsingEPPlus(string fileName)
{
FileInfo fileInfo = new FileInfo(fileName);

ExcelPackage p = new ExcelPackage(fileInfo);

// access the first sheet named Sheet1
ExcelWorksheet myWorksheet = p.Workbook.Worksheets["Sheet1"];

// specify cell values to be used for generating chart.
myWorksheet.Cells["C2"].Value = 10;
myWorksheet.Cells["C3"].Value = 40;
myWorksheet.Cells["C4"].Value = 30;

myWorksheet.Cells["B2"].Value = "Yes";
myWorksheet.Cells["B3"].Value = "No";
myWorksheet.Cells["B4"].Value = "NA";

// add chart of type Pie.
var myChart = myWorksheet.Drawings.AddChart("chart", eChartType.Pie);

// Define series for the chart
var series = myChart.Series.Add("C2: C4", "B2: B4");
myChart.Border.Fill.Color = System.Drawing.Color.Green;
myChart.Title.Text = "My Chart";
myChart.SetSize(400, 400);

// Add to 6th row and to the 6th column
myChart.SetPosition(6, 0, 6, 0);

p.Save();

}

The output –

If we want to do it using Open XML SDK without using EPPlus Library we can refer to the below article.

https://msdn.microsoft.com/en-us/library/office/cc820055.aspx

Hope it helps..

Insert Formula in Cell using C# (OpenXML and EPPlus Library)

Sharing the sample code, we can use to insert forumala in a particular cell in Excel Spreadsheet.

First using Open XML SDK


public static void UpdateExcelUsingOpenXMLSDK(string fileName)
{
// Open the document for editing.
using (SpreadsheetDocument spreadSheet = SpreadsheetDocument.Open(fileName, true))
{
// Access the main Workbook part, which contains all references.
WorkbookPart workbookPart = spreadSheet.WorkbookPart;
// get sheet by name
Sheet sheet = workbookPart.Workbook.Descendants<Sheet>().Where(s => s.Name == "Sheet1").FirstOrDefault();

// get worksheetpart by sheet id
WorksheetPart worksheetPart = workbookPart.GetPartById(sheet.Id.Value) as WorksheetPart;

// The SheetData object will contain all the data.
SheetData sheetData = worksheetPart.Worksheet.GetFirstChild();

Cell formulaCell = InsertCellInWorksheet("B", 10, worksheetPart);
formulaCell.DataType = new EnumValue<CellValues>(CellValues.Number);
formulaCell.CellFormula = new CellFormula("SUM(B2:B7)");

// Save the worksheet.
worksheetPart.Worksheet.Save();

// for recacluation of formula
spreadSheet.WorkbookPart.Workbook.CalculationProperties.ForceFullCalculation = true;
spreadSheet.WorkbookPart.Workbook.CalculationProperties.FullCalculationOnLoad = true;

}
}

private static Cell InsertCellInWorksheet(string columnName, uint rowIndex, WorksheetPart worksheetPart)
{
Worksheet worksheet = worksheetPart.Worksheet;
SheetData sheetData = worksheet.GetFirstChild<SheetData>();
string cellReference = columnName + rowIndex;

// If the worksheet does not contain a row with the specified row index, insert one.
Row row;
if (sheetData.Elements<Row>().Where(r => r.RowIndex == rowIndex).Count() != 0)
{
row = sheetData.Elements<Row>().Where(r => r.RowIndex == rowIndex).First();
}
else
{
row = new Row() { RowIndex = rowIndex };
sheetData.Append(row);
}

// If there is not a cell with the specified column name, insert one.
if (row.Elements<Cell>().Where(c => c.CellReference.Value == columnName + rowIndex).Count() > 0)
{
return row.Elements<Cell>().Where(c => c.CellReference.Value == cellReference).First();
}
else
{
// Cells must be in sequential order according to CellReference. Determine where to insert the new cell.
Cell refCell = null;
foreach (Cell cell in row.Elements<Cell>())
{
if (cell.CellReference.Value.Length == cellReference.Length)
{
if (string.Compare(cell.CellReference.Value, cellReference, true) > 0)
{
refCell = cell;
break;
}
}
}

Cell newCell = new Cell() { CellReference = cellReference };
row.InsertBefore(newCell, refCell);

worksheet.Save();
return newCell;
}
}

Using EPPlus

https://www.nuget.org/packages/EPPlus/


public void UpdateExcelUsingEPPlus(string fileName)
{
FileInfo fileInfo = new FileInfo(fileName);
ExcelPackage p = new ExcelPackage(fileInfo);
ExcelWorksheet myWorksheet = p.Workbook.Worksheets["Sheet1"];

myWorksheet.Cells["B15"].Formula = "SUM(B2:B7)";

p.Save();

}

Hope it helps..

Update Cell value in Excel Spreadsheet using C# (Open XML and EPPlus library)

Sharing a sample code that updates a particular cell’s value in Excel Spreadsheet.

Here we are updating cell B4

First using Open XML SDK


public static void UpdateExcelUsingOpenXMLSDK(string fileName)
{
// Open the document for editing.
using (SpreadsheetDocument spreadSheet = SpreadsheetDocument.Open(fileName, true))
{
// Access the main Workbook part, which contains all references.
WorkbookPart workbookPart = spreadSheet.WorkbookPart;
// get sheet by name
Sheet sheet = workbookPart.Workbook.Descendants<Sheet>().Where(s => s.Name == "Sheet1").FirstOrDefault();

// get worksheetpart by sheet id
WorksheetPart worksheetPart = workbookPart.GetPartById(sheet.Id.Value) as WorksheetPart;

// The SheetData object will contain all the data.
SheetData sheetData = worksheetPart.Worksheet.GetFirstChild();

Cell cell = GetCell(worksheetPart.Worksheet, "B", 4);

cell.CellValue = new CellValue("10");
cell.DataType = new EnumValue<CellValues>(CellValues.Number);

// Save the worksheet.
worksheetPart.Worksheet.Save();

// for recacluation of formula
spreadSheet.WorkbookPart.Workbook.CalculationProperties.ForceFullCalculation = true;
spreadSheet.WorkbookPart.Workbook.CalculationProperties.FullCalculationOnLoad = true;

}
}

private static Cell GetCell(Worksheet worksheet,
string columnName, uint rowIndex)
{
Row row = GetRow(worksheet, rowIndex);

if (row == null) return null;

var FirstRow = row.Elements<Cell>().Where(c => string.Compare
(c.CellReference.Value, columnName +
rowIndex, true) == 0).FirstOrDefault();

if (FirstRow == null) return null;

return FirstRow;
}

private static Row GetRow(Worksheet worksheet , uint rowIndex)
{
Row row = worksheet.GetFirstChild<SheetData>().
Elements<Row>().FirstOrDefault(r => r.RowIndex == rowIndex);
if (row == null)
{
throw new ArgumentException(String.Format("No row with index {0} found in spreadsheet", rowIndex));
}
return row;
}

Now the same code using EPPlus

https://www.nuget.org/packages/EPPlus/


public void UpdateExcelUsingEPPlus(string fileName)
{
FileInfo fileInfo = new FileInfo(fileName);
ExcelPackage p = new ExcelPackage(fileInfo);
ExcelWorksheet myWorksheet = p.Workbook.Worksheets["Sheet1"];
myWorksheet.Cells[4, 2].Value = 10;
p.Save();

}

Hope it helps..

Sample Code to consume UNData API using JavaScript

Sharing a sample code that can be used to consume UNData API

http://data.un.org/Host.aspx?Content=API

The below code fetches the population data for country India.

Sample Code


var xmlHttp;
// creatng the xmlHttp object
xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
// Calling the web service using post and true means asynchronous call
xmlHttp.open("POST", "http://data.un.org/WS/NSIEstatV20Service.asmx", false);

// Setting the request header to let the web service find the soap request we would be sending
xmlHttp.setRequestHeader("Content-Type", "text/xml; charset=utf-8");

xmlHttp.setRequestHeader("SOAPAction", "http://ec.europa.eu/eurostat/sri/service/2.0/extended/GetCompactData");

var soapRequest = "<!--?<span class="hiddenSpellError" pre="" data-mce-bogus="1"-->xml version='1.0' encoding='utf-8'?>"+
"<soap:Envelope xmlns:soap='http://schemas.xmlsoap.org/soap/envelope/' xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance' xmlns:xsd='http://www.w3.org/2001/XMLSchema'>"+
"<soap:Body>"+
"<GetCompactData xmlns='http://ec.europa.eu/eurostat/sri/service/2.0/extended'>"+
"<Query>"+
"<message:QueryMessage xsi:schemaLocation='http://ec.europa.eu/eurostat/sri/service/2.0/SDMXMessage.xsd http://ec.europa.eu/eurostat/sri/service/2.0/%20SDMXMessage.xsd' xmlns:generic='http://www.SDMX.org/resources/SDMXML/schemas/v2_0/generic' xmlns:message='http://www.SDMX.org/resources/SDMXML/schemas/v2_0/message' xmlns:query='http://www.SDMX.org/resources/SDMXML/schemas/v2_0/query' xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance'>"+
"<message:Header>"+
"<message:ID>onh14833545733929527</message:ID>"+
"<message:Test>false</message:Test>"+
"<message:Prepared>2017-01-01</message:Prepared>"+
"<message:Sender id='online-help' />"+
"</message:Header>"+
"<message:Query>"+
"<query:DataWhere>"+
"<query:And>"+
"<query:Dimension id='INDICATOR'>SP_POP_TOTL</query:Dimension>"+
"<query:Dimension id='AGE'>_T</query:Dimension>"+
"<query:Dimension id='SEX'>_T</query:Dimension>"+
"<query:Dimension id='LOCATION'>_T</query:Dimension>" +
"<query:Dimension id='REF_AREA'>DEU</query:Dimension>" +
"<query:Dimension id='SCENARIO'>H</query:Dimension>"+
"<query:Time>"+
"<query:StartTime>2014-01-02</query:StartTime>"+
"<query:EndTime>2017-01-02</query:EndTime>"+
"</query:Time>"+
"<query:Dataflow>DF_UNDATA_WPP</query:Dataflow>"+
"</query:And>"+
"</query:DataWhere>"+
"</message:Query>"+
"</message:QueryMessage>"+
"</Query>"+
"</GetCompactData>"+
"</soap:Body>" +
"</soap:Envelope>";

xmlHttp.send(soapRequest);
var xmlDoc = jQuery.parseXML(xmlHttp.responseText);
var popValue = xmlDoc.getElementsByTagName('ns1:Obs')['0'].attributes['OBS_VALUE'].nodeValue;
alert("Total Population " + popValue);

Output


<?xml version="1.0" encoding="utf-8"?>
<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:xsd="http://www.w3.org/2001/XMLSchema">
<soap:Body><GetCompactDataResponse
xmlns="http://ec.europa.eu/eurostat/sri/service/2.0/extended">
<GetCompactDataResult>
<CompactData
xmlns:ns1="urn:sdmx:org.sdmx.infomodel.datastructure.DataStructure
=UNSD:DSD_WPP_UNDATA(1.0):ObsLevelDim:TIME_PERIOD"
xmlns="http://www.SDMX.org/resources/SDMXML/schemas/v2_0/message"
xmlns:common="http://www.SDMX.org/resources/SDMXML/schemas/v2_0/common"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:xml="http://www.w3.org/XML/1998/namespace"><Header>
<ID>DF_UNDATA_WPP</ID><Test>false</Test><Prepared>2017-01-06T08:25:46
</Prepared>
<Sender id="1B0">
<Name xml:lang="en">United Nations Statistics Division</Name>
<Contact><Email>statistics@un.org</Email></Contact></Sender>
<KeyFamilyRef>DSD_WPP_UNDATA</KeyFamilyRef><KeyFamilyAgency>UNSD
</KeyFamilyAgency><DataSetAgency>UNSD</DataSetAgency>
<DataSetID>DF_UNDATA_WPP_1B0_2017-01-06T082546</DataSetID>
<DataSetAction>Information</DataSetAction>
<Extracted>2017-01-06T08:25:46</Extracted>
<Source xml:lang="en">
United Nations Population Division World Population Prospects</Source>
</Header>
<ns1:DataSet DATASET_NAME="World Population Prospects"
DATASET_SOURCE="United Nations Population Division"
DATASET_DESC="The United Nations World Population Prospects contains estimates and projections for every country in the world, including estimates and projections of demographic indicators such as birth rates, deaths rates, infant mortality rates and life expectancy." UNDATA_LASTUPDATE="20 Aug 2013" UNDATA_NEXTUPDATE="2015 release" METADATA="http://esa.un.org/unpd/wpp/index.htm"><ns1:Series AGE="_T" FREQ="A" INDICATOR="SP_POP_TOTL" LOCATION="_T" SEX="_T" REF_AREA="DEU" SCENARIO="H"><ns1:Obs TIME_PERIOD="2015" OBS_VALUE="83178.615" UNIT="NUMBER" UNIT_MULT="3" TIME_SPAN="2015" /></ns1:Series></ns1:DataSet></CompactData></GetCompactDataResult></GetCompactDataResponse></soap:Body></soap:Envelope>

Hope it helps.

Sample code to consume UNData API in C#

Hi,

Recently we were working on an application that had to fetch country specific details. For this we used the UNData API.

http://data.un.org/Host.aspx?Content=API

We can make use of SDMX Browser in helping us to write a query

http://data.un.org/SdmxBrowser/start

Create a console app\windows application and add web reference to the following web service

http://data.un.org/WS/NSIEstatV20Service.asmx

Below is the sample C# Code


string queryMsg = @"<message:QueryMessage
xsi:schemaLocation='http://ec.europa.eu/eurostat/sri/service/2.0/SDMXMessage.xsd
http://ec.europa.eu/eurostat/sri/service/2.0/%20SDMXMessage.xsd'
xmlns:generic='http://www.SDMX.org/resources/SDMXML/schemas/v2_0/generic'
xmlns:message='http://www.SDMX.org/resources/SDMXML/schemas/v2_0/message'
xmlns:query='http://www.SDMX.org/resources/SDMXML/schemas/v2_0/query'
xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance'>
<message:Header>
<message:ID>onh14833545733929527</message:ID>
<message:Test>false</message:Test>
<message:Prepared>2017-01-01</message:Prepared>
<message:Sender id='online-help'/>
</message:Header>
<message:Query>
<query:DataWhere>
<query:And>
<query:Dimension id='INDICATOR'>SP_POP_TOTL</query:Dimension>
<query:Dimension id='AGE'>_T</query:Dimension>
<query:Dimension id='SEX'>_T</query:Dimension>
<query:Dimension id='LOCATION'>_T</query:Dimension>
<query:Dimension id='REF_AREA'>IND</query:Dimension>
<query:Time>
<query:StartTime>2014-01-02</query:StartTime>
<query:EndTime>2017-01-02</query:EndTime>
</query:Time>
<query:Dataflow>DF_UNDATA_WPP</query:Dataflow>
</query:And>
</query:DataWhere>
</message:Query>
</message:QueryMessage>";
NSIEstatV20Service service = new NSIEstatV20Service();
System.Xml.XmlDocument queryMessageDocument = new XmlDocument();
queryMessageDocument.LoadXml(queryMsg);
System.Xml.XmlNode queryMessage = queryMessageDocument.DocumentElement;
var result = service.GetCompactData(queryMessage);
MessageBox.Show(result.InnerXml);

The output

The query here basically returns the Total population of India

Hope it helps..