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POHow to select an item from a filling of a DataGridViewComboBox
 

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  1. POHow to select an item from a filling of a DataGridViewComboBox
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    <p>Project: Winforms, .NET framework: 3.5 (Visual Studio 2008)</p> <p>My problem is:</p> <p>I have a <code>DataGridView</code> with several columns, some of the type and another type <code>DataGridViewTextBoxColumn</code>, <code>DataGridViewComboBoxColumn</code>, <code>DataGridViewComboBoxColumn</code> column is filled by an entity supplied by the Entity Framework.</p> <pre><code>// Example ((System.ComponentModel.ISupportInitialize)(this.EntityBindingSource)).BeginInit(); this.EntityBindingSource.DataSource = this.dtContext.ExampleEntity; this.ComboColumn.DataSource = this.EntityBindingSource; this.ComboColumn.DataPropertyName = "ExampleId"; this.ComboColumn.DisplayMember = "Example"; this.ComboColumn.ValueMember = "ExampleId"; </code></pre> <p>When you run and load the form, fine</p> <p>But the problem comes when at runtime I want to select an item from the collection of <code>DataGridViewComboBoxColumn</code></p> <p>That in the event <code>CellEndEdit</code></p> <pre><code>private void dgvDetalle_CellEndEdit(object sender, DataGridViewCellEventArgs e) { DataGridViewCell cell = dgvDetalle.CurrentCell; DataGridViewComboBoxCell comboCell = (DataGridViewComboBoxCell)this.dgvDetalle.CurrentRow.Cells["ComboColumn"]; // Attempt 1 comboCell.Value = (ExampleEntity)comboTarifaImpuesto.Items[0]; // Attempt 2 comboCell.Value = ObjetoEntity; // Attempt 3 comboCell.Value = "ValueExample" // Attempt 4 comboCell.Value = ObjetoEntity.ToString(); } </code></pre> <ul> <li>Try selecting one item from combobox</li> <li>Try selecting an object of the entity</li> <li>Try selecting by means of a chain or Display Member Value</li> </ul> <p>and I can not select the desired items, I get the exception:</p> <blockquote> <p>DataGridViewComboBoxCell value is invalid</p> </blockquote>
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