C# Datagridview，第一列（ID）必须是主键，不使用数据库，如何设置？

Question

I have a small problem, don't know how to setup primary key for first column (ID)? Can somebody help?

This is my code:

Datatable tabela;

private void Admin_Load(object sender, EventArgs e)
{
    tabela = new DataTable();
    //this column should be primary key
    tabela.Columns.Add("ID", typeof(int));
    tabela.Columns.Add("Naziv", typeof(string));
    tabela.Columns.Add("Zanr", typeof(string));
    tabela.Columns.Add("Duzina", typeof(int));
    tabela.Columns.Add("Granica godina: ", typeof(int));
    dataGridView1.DataSource = tabela;
}

Answer 1

Use GIUD as a string if you want like this:

string guid = System.Guid.NewGuid().ToString()

Even thought the possibility of having a duplicate GIUD is negligible, but in your case, you are having a "figurative" Id which means that you would not know IF you ever had a duplicate Id, I should mention that using a giud for an id instead of a number is a wast of memory and it's inefficient in these cases, but I don't know what's your point.

PS: if you want a number and nothing else, use a random numbers generatore, but the possibility to get a duplicate ID will increase inversely with respect to the range of numbers you specify:

Random r = new Random();
r.Next(start_range, end_range);