Family Family Family Family - 1 year ago 127
C# Question

Can write to csv file but not append

string pathDesktop = Environment.GetFolderPath(Environment.SpecialFolder.Desktop);
string filePath = pathDesktop + "\\mycsvfile.csv";
string delimter = ",";
string a = "Enoelpro---[037,033,0,018,030,012,004,021,009,038,035,053,044,050,074,F,018,010,070,000]<Vulpix>[-][037,034,0,022,020,029,002,008,024,036,046,049,041,057,077,F,018,005,070,000]<Vulpix>[-] cual es mejor??";
List<string[]> test = conv(a,"testrainer");
int length = test.Count;

using (TextWriter writer = File.CreateText(filePath))
for (int index = 0; index < length; index++)
writer.WriteLine(string.Join(delimter, test[index]));

So, at the momement, this works fine, except it doesn't keep the old data in the csv file. How can I modify this so instead of deleting the data, it simply appends to the data?

Answer Source

File.CreateText Method (String)

This method is equivalent to the StreamWriter(String, Boolean) constructor overload with the append parameter set to false. If the file specified by path does not exist, it is created. If the file does exist, its contents are overwritten. Additional threads are permitted to read the file while it is open.

StreamWriter Constructor (String, Boolean)

Here second parameter, true to append data to the file; false to overwrite the file.

If you check the documentation for each method it cleary say the answers for your questions and also there is a suggetion in case of you need to append the file. Use StreamWriter constructor with path and append parameter (true)

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