Question

我的屏幕上有100个图片框，代表100张图片，对应100个菜肴。我需要的是刷新100乘100的图像，但我在foreach（PictureBox miPicture in this.Controls）中得到以下错误：

发生了类型为“System.InvalidCastException”的未处理异常   在Cheff2000.exe中

附加信息：无法投射类型的对象   'System.Windows.Forms.Button'类型'System.Windows.Forms.PictureBox'。

我的空白是：

    private void CapturaRecetasBtnFam()     // SOLO Captura las primeras Recetas de la Fam cuando se hace Click en el BtnFam-n
    {
        BlanquearRec();
        oListaFamRec = objFamRec.Listar();
        var miFami = oListaFamRec.Find(DescFam => DescFam.Descripcion == NomFam);
        // The cod captured the ongoing fam
        string CodFam = oListaFamRec[miFami.Posicion - 1].Codigo;
        oListaReceta = objRec.ListarPosicionEnFam();
        var Result = from sigreceta in oListaReceta where sigreceta.Familia == CodFam select sigreceta;

        // We assign text and images to objects (Button and PictureBox) of Recipes
        ContRec1 = 1;
        ContRec2 = 1;
        foreach (Vi_Receta Rec in Result)
        {
            // Textos a los Button
            nomBoton = "BtnRec" + Convert.ToString(ContRec1);
            nomPicture = "PicRec" + Convert.ToString(ContRec2);
            foreach (Control miObjeto in this.Controls)
            {
                if (miObjeto is Button && miObjeto.Name == nomBoton)
                {
                    miObjeto.Text = Rec.Descripcion;

                    ContRec1++;
                }
            }
            // PictureBox pictures
            foreach (PictureBox miPicture in this.Controls)
            {
                if (miPicture.Name == nomPicture && miPicture.Name == nomPicture)
                {
                    miPicture.Image = Rec.Foto == null ? null : ConvertByteArrayToImage(Rec.Foto);
                }
            }


        }
    }

Answer 1

问题出在你的foreach循环中。你现在的方式，它枚举所有控件，包括按钮，导致错误。它应该看起来像这样（未经测试）：

foreach (Control cPicture in this.Controls)
{
    if (cPicture is PictureBox)
    {
        PictureBox miPicture = (PictureBox)cPicture;

        if (miPicture.Name == nomPicture && miPicture.Name == nomPicture)
        {
            miPicture.Image = Rec.Foto == null ? null : ConvertByteArrayToImage(Rec.Foto);
        }
    }
}

在控件Picturebox中分配多张图片

1 个答案: