CODEWITHSUNDEEP
c#linq
Mirko
Mirko

Reputation: 1

unhandled exception of type 'System.InvalidCastException' occurred...Unable to cast object of type 'System.String' to type

could anyone help me please? Following my code and "An unhandled exception of type 'System.InvalidCastException' occurred in GelatoProject.exe

Additional information: Unable to cast object of type 'System.String' to type 'GelatoProject.RecipeVariables'." is the message. 

// ...
using (var db = new GelatoProjectDBEntities())
{
    RecipeVariables selected = 
        (RecipeVariables)comboBoxRecipeDetail.SelectedItem;

    var results = (from x in db.Recipe_Parameters
                select new RecipeVariables 
                        { 
                            Id = x.Id, 
                            RecipeDetail = x.recipeDetail, 
                            Parameter = x.parameter, 
                            RangeDetail = x.rangeDetail, 
                            RangeValue = x.value.ToString() 
                        }
               )
                .Where(x => x.RecipeDetail == selected.RecipeDetail && x.Parameter == "totalsolids" && x.RangeDetail == "Max")
                .FirstOrDefault();

    totsolidsRangeMax = decimal.Parse(results.RangeValue);

    MessageBox.Show(totsolidsRangeMax.ToString());
}
// ...

class RecipeVariables
{
    public int Id { get; set; }
    public string NameIngredient { get; set; }
    public string Brand { get; set; }
    public string LBName { get { return NameIngredient + " - " + Brand;}}
    public string RecipeDetail { get; set; }
    public string Parameter { get; set; }
    public string RangeDetail { get; set; }
    public string RangeValue { get; set; }
}

Upvotes: 0

Views: 1204

Answers (1)

Tadija Bagarić
Tadija Bagarić

Reputation: 2701

RecipeVariables selected = (RecipeVariables)comboBoxRecipeDetail.SelectedItem;

comboBoxRecipeDetail.SelectedItem is a string - text that you see when you clicked on the combobox. It can not be cast to RecipeVariables

Change your code to:

using (var db = new GelatoProjectDBEntities())
{
    RecipeVariables selected = new RecipeVariables()
                               {
                                   RecipeDetail = (string)comboBoxRecipeDetail.SelectedItem
                               };

    // var results = ...
}

This will create a new RecipeVariables object and then set its RecipeDetail property to the text for selected combobox item.

Upvotes: 2

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