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so far I have this one which works really good.
private static MovieItem readCSV(string path)
{
var yourData = File.ReadAllLines(path)
.Skip(1)
.Select(x => x.Split(';'))
.Select(x => new Movie
{
GUID = x[0],
Title = x[1],
ISBN = x[2],
CreatedTime = DateTime.Now,
AuthorInformation = new AuthorInformation()
{
Id = Guid.NewGuid().ToString(),
Name = x[4],
Address = x[5],
Age = x[6]
}
}).ToArray();
return yourData[0];
}
My question is, is there a better way to assign the object?
So far I have like GUID = x[0], Title = x[1] and so on... it's not good because the header in the first row can change, so I want to be flexible.
Is there a way to assign e.g. GUID to the CSV header named GUID?
Like looking for the header name and if it is equal GUID, assign the content to GUID?
CSV File:
I've commented your question that already but here's a sample code:
1- Make a class and name it "Book" or whatever convenient. It's fields would be GUID, Title, ISBN, etc..
public class Book //I'm showing only one field of the class
{
private string title;
public string Title { get; set;}
public Book() {}
}
2-Read your CSV file onetime where you will read the first line only and split it to a string[] array -your splitter is ";"- and store the index of each field to a variable (Switch statement would be very helpful here)
public struct Headers //use it to store the index of each field in the file only title is shown here
{
public int title;
}
string[] rowSplitter = new string[] { "\r\n" };
string[] colSplitter = new string[] { ";" };
//Inside a method for reading the file use the following code
string[] csvData = File.ReadAllText(csvFile).Split(rowSplitter, StringSplitOptions.RemoveEmptyEntries);
string[] headerRow = csvData [0].Split(colSplitter, StringSplitOptions.None);
Headers column = new Headers();
for (int i = 0; i < headerRow.Length; i++)
{
switch (headerRow[i].ToLower())
{
case "title":
column.title = i;
break;
}
}
3- Use a loop to go through all the lines, Split by ";" again, and inside this loop instantiate a Book() object with corresponding data cuz now you know the index of each data item -the variables I mentioned.
for (int i = 1; i < csvData.Length; i++)
{
string[] currentRow = csvData[i].Split(colSplitter, StringSplitOptions.None);
Book bookItem = new Book();
bookItem.Title = currentRow[column.title];
//Here you can do whatever you like with this bookItem on-the-fly or if you want to keep it to the end of your code add it to a list.
}
//reading all the lines(rows) from the file.
string[] rows = File.ReadAllLines(Directory.GetFiles(#"D:\CSV\test.csv"));
DataTable dtData = new DataTable();
string[] rowValues = null;
DataRow dr = dtData.NewRow();
//Creating columns
if (rows.Length > 0)
{
foreach (string columnName in rows[0].Split(','))
dtData.Columns.Add(columnName.Replace(" ", "").ToLower());
}
//Creating row for each line.(except the first line, which contain column names)
for (int row = 1; row < rows.Length; row++)
{
rowValues = rows[row].Split(',');
dr = dtData.NewRow();
dr.ItemArray = rowValues;
dtData.Rows.Add(dr);
}
Related
This question already has an answer here:
System.Collections.Generic.List <string>' does not contain a definition for 'equals' [closed]
(1 answer)
Closed 6 years ago.
I have a query that contains hexadecimal codes and when there is a hexadecimal code I want to apply a background-color to the previous data in my table, but it's written
background-color:System.Collections.Generic.List`1[System.String]
to each line in my source code.
Here is my code :
<tr>
#{
int nbItems = ViewBag.listDonnees.Count;
var hashCodes = new List<String>() { "#FFFFFF", "#FFD700", "#FF6347" };
for (int cpt = 0; cpt < nbItems; cpt++)
{
string colorcode = string.Empty;
if (cpt + 1 < nbItems)
{
var mylist = (IEnumerable < dynamic >) ViewBag.listDonnees[cpt];
colorcode = mylist.FirstOrDefault(s => hashCodes.Contains(s));
}
if (colorcode != string.Empty)
{
<td style="background-color:#ViewBag.listDonnees[cpt+1]">colorcode</td>
}
else
{
var str = String.Join(",", ViewBag.listDonnees[cpt]);
<td>str</td>
}
cpt++;
}
}
</tr>
And I would like replace "colorcode" by the current data and listDonnees is a List < List < string > >
My model :
dac = new SqlDataAdapter();
dac.SelectCommand = cmd1;
dsp = new DataSet();
dac.Fill(dsp, "donnees");
List<List<string>> listDonnees = new List<List<string>>();
foreach (DataRow row in dsp.Tables["donnees"].Rows)
{
List<string> l = new List<string>();
for (int i = 0; i < row.ItemArray.Length; i++)
{
l.Add(row[i].ToString());
}
listDonnees.Add(l);
}
list.Add("donnees", listDonnees);
My Controller :
public ActionResult AfficheRspic002(string Tdate_d, string Ddl_fampic, string Ddl_donnee, string Ddl_detail, string Ddl_caracteristique, string Ddl_poste, string Ddl_ilot, string Ddl_nposte, string Ddl_atelier, string Ddl_tposte)
{
Dictionary<string, object> list = model.getPICv2(Tdate_d,Ddl_fampic, Ddl_donnee, Ddl_detail, Ddl_caracteristique, Ddl_poste, Ddl_ilot, Ddl_nposte, Ddl_atelier, Ddl_tposte);
ViewBag.listEntete = list["entete"];
ViewBag.listJO = list["jo"];
ViewBag.listPrevision = list["prevision"];
ViewBag.listCommandeEt = list["commande"];
ViewBag.listDonnees = list["donnees"];
return PartialView();
}
Thank you in advance for your help
As you mentioned
listDonnees is a List < List < string > >
then of course, #ViewBag.listDonnees[cpt+1] will be list of string. You should store colorcode in ViewBag, not list of colorcode.
May be if you post how you are selecting color from list then we can give you more concrete answer.
I'm attempting to import a CSV file into a DataTable, however the CSV contains headers that are the same. (For example, there are multiple "Date" headers for different form sections). To fix this, I decided to create a loop that will run through the headers and replace the duplicates or unwanted entries based on their position. I've replaced my replaceWith array with dummy entries, but my actual code does have the correct size to correlate with the replace array.
string[] columnNames = null;
string[] oStreamDataValues = null;
int[] error = {0,1,2,3,4,7,8,9,10,11,15,21,34,37,57,61,65,68,69,71,75,79,82,83,85,89,93,96,97,99,103,107,110,111,113,117,121,124,125,127,128,129,130,132,182,210,212,213,214,215,216,222,226,239};
int[] replace = {14,16,17,17,20,23,24,27,28,29,31,32,44,58,59,60,62,63,64,66,67,70,72,73,74,76,77,78,80,81,84,86,87,88,90,91,92,94,95,98,100,101,102,104,105,106,108,109,112,114,115,116,118,119,120,122,123,126,134,136,138,140,142,144,146,148,150,152,154,156,158,160,162,164,166,168,170,172,174,176,178,180,184,186,187,188,190,191,192,194,195,196,198,199,200,202,203,204,206,207,208,209,236,242,243,244};
string[] replaceWith = {"Replace 1", "Replace 2", "Replace 3"};
string fix = "ignore_";
int inc = 00;
string entry = "";
while (!oStreamReader.EndOfStream)
{
string oStreamRowData = oStreamReader.ReadLine().Trim();
if (oStreamRowData.Length > 0)
{
//oStreamDataValues = Regex.Split(oStreamRowData, ",(?=(?:[^']*'[^']*')*[^']*$)");
oStreamDataValues = oStreamRowData.Split(',');
if (rowCount == 0)
{
rowCount = 1;
columnNames = oStreamDataValues;
for (int i = 0; i < columnNames.Length; i++)
{
for (int j = 0; j < error.Length; j++)
{
if (error[j] == i)
{
entry = fix + inc++;
}
}
for (int k = 0; k < replace.Length; k++)
{
if (replace[i] == i)
{
int add = 0;
entry = replaceWith[add++];
}
}
DataColumn oDataColumn = new DataColumn(entry, typeof(string));
oDataColumn.DefaultValue = string.Empty;
oDataTable.Columns.Add(oDataColumn);
}
}
}
I'm no coding expert, so my syntax/decision making isn't perfect.
However the error that I get is that A column named 'ignore_4' already belongs to this DataTable.
I assume something is incorrect in my loop logic.
I think you have overcomplicated the loops. You just need to keep an index of the current position in the array of errors and array of replaces.
string rep = "replace_"; // base string for replace fields
string fix = "ignore_"; // base string for ignore fields
// For demonstation purpose I have commented out this array. If you
// want every 'replace' column have its specific name then prepare this
// array with exactly the number of names required by the number of
// elements in the replace array
//
// string[] replaceWith = {"Replace 1", "Replace 2", "Replace 3"};
int idxErrors = 0; // Current position in the error array
int idxReplace = 0; // Current position in the replace array
int fixCounter = 1;
int repCounter = 1;
string entry = "";
for (int i = 0; i < columnNames.Length; i++)
{
// Is this the index of a column that should be ignored?
if (idxErrors < error.Length && i == error[idxErrors])
{
entry = fix + fixCounter.ToString("D2");
idxErrors++;
fixCounter++;
}
// Is this the index of a column that should have a different name??
else if (idxReplace < replace.Length && i == replace[idxReplace])
{
entry = rep + repCounter.ToString("D2");
// entry = replaceWith[repCounter];
idxReplace++;
repCounter++;
}
else
entry = columnNames[i];
// Now create the column
DataColumn oDataColumn = new DataColumn(entry, typeof(string));
oDataColumn.DefaultValue = string.Empty;
oDataTable.Columns.Add(oDataColumn);
}
In this example I have used the same pattern used for the ignored column also for the columns that need to have the name changed. If you want to give each renamed column a proper name, then you need to prepare an array with these proper names and this array should be of the same length of the replace array. Then use the idxReplace to take the correct name from the array of possible proper names.
I am getting a list of items from a csv file via a Web Api using this code:
private List<Item> items = new List<Item>();
public ItemRepository()
{
string filename = HttpRuntime.AppDomainAppPath + "App_Data\\items.csv";
var lines = File.ReadAllLines(filename).Skip(1).ToList();
for (int i = 0; i < lines.Count; i++)
{
var line = lines[i];
var columns = line.Split('$');
//get rid of newline characters in the middle of data lines
while (columns.Length < 9)
{
i += 1;
line = line.Replace("\n", " ") + lines[i];
columns = line.Split('$');
}
//Remove Starting and Trailing open quotes from fields
columns = columns.Select(c => { if (string.IsNullOrEmpty(c) == false) { return c.Substring(1, c.Length - 2); } return string.Empty; }).ToArray();
var temp = columns[5].Split('|', '>');
items.Add(new Item()
{
Id = int.Parse(columns[0]),
Name = temp[0],
Description = columns[2],
Photo = columns[7]
});
}
}
The Name attribute of the item list must come from column whose structure is as follows:
Groups>Subgroup>item
Therefore I use var temp = columns[5].Split('|', '>'); in my code to get the first element of the column before the ">", which in the above case is Groups. And this works fine.
However, I a getting many duplicates in the result. This is because other items in the column may be:
(These are some of the entries in my csv column 9)
Groups>Subgroup2>item2, Groups>Subgroup3>item4, Groups>Subgroup4>item9
All start with Groups, but I only want to get Groups once.
As it is I get a long list of Groups. How do I stop the duplicates?
I want that if an Item in the list is returned with the Name "Groups", that no other item with that name would be returned. How do I make this check and implement it?
If you are successfully getting the list of groups, take that list of groups and use LINQ:
var undupedList = dupedList
.Distinct();
Update: The reason distinct did not work is because your code is requesting not just Name, but also, Description, etc...If you only ask for Name, Distinct() will work.
Update 2: Try this:
//Check whether already exists
if((var match = items.Where(q=>q.Name == temp[0])).Count==0)
{
items.add(...);
}
How about using a List to store Item.Name?
Then check List.Contains() before calling items.Add()
Simple, only 3 lines of code, and it works.
IList<string> listNames = new List();
//
for (int i = 0; i < lines.Count; i++)
{
//
var temp = columns[5].Split('|', '>');
if (!listNames.Contains(temp[0]))
{
listNames.Add(temp[0]);
items.Add(new Item()
{
//
});
}
}
I can easily pass a data file to a 2D array if I know the size of the data file, but thats pretty pointless when you want to add and remove data.
How can I instantiate a 2D array of that Data rows length that is global and not out of scope to the rest of the program?
Here is the usual code, for an array of 4 rows and 6 columns, but I want to add/remove data to the data file making it of unknown length in rows.
string[,] allStudentData = new string[4, 6];
string[] allStudents = File.ReadAllLines("data.txt");
for (int i = 0; i < allStudents.Count(); i++)
{
for (int j = 0; j < 6; j++)
{
string[] DataIn = allStudents[i].Split(',');
allStudentData[i, j] = DataIn[j];
}
}
Thanks for your ideas :-)
Why not use something mutable, like a List ?
You can add columns using the .Add() command, , and you can collapse it into an array when you're done with it (.ToArray())
you can do as below
var result = File.ReadAllLines("data.txt").Select(x=>x.Split(',')).ToArray();
You can use a List that holds a custom object (it could be an array) instead of Array and then at the end convert the list to an array with the ToArray extension:
var list = new List<string[]>();
var data1 = new string[2] {"1", "2" };
var data2 = new string[3] {"1", "2", "3" };
list.Add(data1);
list.Add(data2);
list.ToArray(); // converts the list to string[][]
After you are done reading the file you could add easily more items to the list and then at the end write all modifications to the file. If you think, that in future you will need more than the two dimensional array, than it's worth it to create a custom object like:
public class Student
{
public string Name { get; set; }
public int Grade { get; set; }
}
and use this instead of the string[]:
var studentData = new List<Student>();
The maintenance later will be much more easier (adding address, classes, and so on). I admit, you will have a little more work to do when reading and writing, but if the project grows it will pay off.
You can still use LINQ to read the data on one line:
// creates a List<Student>
var studentData = File.ReadAllLines("data.txt")
.Select(row => row.Split(','))
.Select(elements =>
new Student
{
Name = elements[0],
Grade = int.Parse(elements[1])
}).ToList();
If the number of columns is always 6 and only the number of rows is unknown. Just change the first 2 rows of your code to:
string[] allStudents = File.ReadAllLines("data.txt");
string[,] allStudentData = new string[allStudents.Count(), 6];
If the number of columns is unknown you can do this to get a 2D result:
var not2DResult = File.ReadAllLines("data.txt").Select(x => x.Split(',')).ToArray();
var maxRow = not2DResult.Count()-1;
int maxColumn = Enumerable.Select(not2DResult, c => c.Count()).Max()-1;
var result2D = new string[maxRow, maxColumn];
for (int rowNumber = 0; rowNumber < maxRow; rowNumber++)
{
var row = not2DResult[rowNumber];
for (int columnNumber = 0; columnNumber < row.Count(); columnNumber++)
{
result2D[rowNumber, columnNumber] = row[columnNumber];
}
}
Try using a Lists to hold the file information.
var myList = new List<string>();
myList = File.ReadLines("data.txt");
var my2DList = new List<List<string>>();
foreach(string line in myList)
my2DList.Add(line.Split(','));
If you want to know the number of lines, just use:
int numberOfLines = my2DList.Count;
For the number of items in an individual line:
int lengthOfLine3 = my2DList[3].Length;
I have a .csv with the following headers and an example line from the file.
AgentID,Profile,Avatar,In_Time,Out_Time,In_Location,Out_Location,Target_Speed(m/s),Distance_Traveled(m),Congested_Duration(s),Total_Duration(s),LOS_A_Duration(s),LOS_B_Duration(s),LOS_C_Duration(s),LOS_D_Duration(s),LOS_E_Duration(s),LOS_F_Duration(s)
2177,DefaultProfile,DarkGreen_LowPoly,08:00:00,08:00:53,East12SubwayportalActor,EWConcourseportalActor,1.39653,60.2243,5.4,52.8,26.4,23,3.4,0,0,0
I need to sort this .csv by the 4th column (In_time) by increasing time ( 08:00:00, 08:00:01) and the 6th (In_Location) by alphabetical direction (e.g. East, North, etc).
So far my code looks like this:
List<string> list = new List<string>();
using (StreamReader reader = new StreamReader("JourneyTimes.csv"))
{
string line;
while ((line = reader.ReadLine()) != null)
{
line.Split(',');
list.Add(line);
}
I read in the .csv and split it using a comma (there are no other commas so this is not a concern). I then add each line to a list. My issue is how do I sort the list on two parameters and by the headers of the .csv.
I have been looking all day at this, I am relatively new to programming, this is my first program so I apologize for my lack of knowledge.
You can use LINQ OrderBy/ThenBy:
e.g.
listOfObjects.OrderBy (c => c.LastName).ThenBy (c => c.FirstName)
But first off, you should map your CSV line to some object.
To map CSV line to object you can predefine some type or create it dynamically
from line in File.ReadLines(fileName).Skip(1) //header
let columns = line.Split(',') //really basic CSV parsing, consider removing empty entries and supporting quotes
select new
{
AgentID = columns[0],
Profile = int.Parse(columns[1]),
Avatar = float.Parse(columns[2])
//other properties
}
And be aware that like many other LINQ methods, these two use deferred execution
You are dealing with two distinct problems.
First, ordering two columns in C# can be achieved with OrderBy, ThenBy
public class SpreadsheetExample
{
public DateTime InTime { get; set; }
public string InLocation { get; set; }
public SpreadsheetExample(DateTime inTime, string inLocation)
{
InTime = inTime;
InLocation = inLocation;
}
public static List<SpreadsheetExample> LoadMockData()
{
int maxMock = 10;
Random random = new Random();
var result = new List<SpreadsheetExample>();
for (int mockCount = 0; mockCount < maxMock; mockCount++)
{
var genNumber = random.Next(1, maxMock);
var genDate = DateTime.Now.AddDays(genNumber);
result.Add(new SpreadsheetExample(genDate, "Location" + mockCount));
}
return result;
}
}
internal class Class1
{
private static void Main()
{
var mockData = SpreadsheetExample.LoadMockData();
var orderedResult = mockData.OrderBy(m => m.InTime).ThenBy(m => m.InLocation);//Order, ThenBy can be used to perform ordering of two columns
foreach (var item in orderedResult)
{
Console.WriteLine("{0} : {1}", item.InTime, item.InLocation);
}
}
}
Now you can tackle the second issue of moving data into a class from Excel. VSTO is what you are looking for. There are lots of examples online. Follow the example I posted above. Replace your custom class in place of SpreadSheetExample.
You may use a DataTable:
var lines = File.ReadAllLines("test.csv");
DataTable dt = new DataTable();
var columNames = lines[0].Split(new char[] { ',' });
for (int i = 0; i < columNames.Length; i++)
{
dt.Columns.Add(columNames[i]);
}
for (int i = 1; i < lines.Length; i++)
{
dt.Rows.Add(lines[i].Split(new char[] { ',' }));
}
var rows = dt.Rows.Cast<DataRow>();
var result = rows.OrderBy(i => i["In_time"])
.ThenBy(i => i["In_Location"]);
// sum
var sum = rows.Sum(i => Int32.Parse(i["AgentID"].ToString()));