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Pablo Simon DiEstefano
Asked: 2020-01-31 03:19:35 +0800 CST 2020-01-31 03:19:35 +0800 CST

Load string in DataGridView

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I create a DataGridView with a CheckBox column so I can check one or the other row.

As data source of the DataGridView I pass a list of strings. When passing the list, I expected to get a datagridview that would show me as the first column, a checkbox column and the second column the strings of the list, but no, instead of the strings it shows me its length:

Image table

In the Length column I should (or would like) to display the strings passed through the list and not their length.

The way to generate the "Selection" column is as follows:

DataGridViewCheckBoxColumn column = new DataGridViewCheckBoxColumn();
column.HeaderText = "Seleccion";
column.Name = "Seleccion";
column.TrueValue = true;
column.FalseValue = false;
column.IndeterminateValue = false;
column.ThreeState = false;
column.ValueType = typeof(Boolean);

dgRemotas.Columns.Add(column);

and to add the string list I do the following:

dgRemotas.DataSource = list;

list is defined as:

public List<string> list;

How can I display strings instead of their length?

c#

2 Answers

  1. Best Answer

    By default it DataGridViewhas the property AutoGenerateColumnsset to true. Having that property turned on, it DataGridViewtries to get the properties of the objects DataSourceyou're passing to it. But, it turns out that it stringonly has one property, and that is Length. That's why it shows you that column.

    To fix it, the first step is to disable AutoGenerateColumns:

    dgRemotas.AutoGenerateColumns = false;

    Then, you must add the second column that must show those stringof your list:

    DataGridViewTextBoxColumn column2 = new DataGridViewTextBoxColumn();
column2.HeaderText = "Texto";
column2.Name = "Texto";
column2.DataPropertyName = "Valor";
dgRemotas.Columns.Add(column2);

    Trust him DataPropertyName. We must pass DataSourcea list of objects that have a property called Valor, so we do the following:

    dgRemotas.DataSource = lista.Select(x => new { Valor = x }).ToList();

    In this way, we generate a list of objects with a property called Valorthat contains the text to display.

    • 5

  2. By default DataGridViewit will look at the properties of the container objects in the list. For stringthere is only one property - length. So, you need a wrapper for a string, like this:

    public class StringValue
{
    public StringValue(string s)
    {
        _value = s;
    }
    public string Value { get { return _value; } set { _value = value; } }
    string _value;
}

    Next, you bind the object List<StringValue>to the DataGridView.

    List<StringValue> list = new List<StringValue>();

//Rellenamos lista
list.Add(new StringValue("texto"));

dgRemotas.DataSource = list;

    NOTE: Answer obtained from this link .

    • 1