Why I'm always getting IndexValue -1 of Array-CodePudding

I'm always getting indexValue -1 of ProductType[] Array, when I select array of product value.

Is there something wrong with my code?

Any help is appreciated. Thanks!

ViewModel:

public ProductType[] ProductTypesSel { get; set; }
private int _ProductTypeIndex = -1;

public int ProductTypeIndex
{
    get { return _ProductTypeIndex; }
    set
    {
        _ProductTypeIndex = value;

        if (value >= 0)
        {
            Item.ProductType = ProductTypesSel[value].Code;
        }
        
        OnPropertyChanged(nameof(ProductTypeDisp));
        Console.WriteLine(ProductTypeDisp);
    }
}
public string ProductTypeDisp => Config != null && ProductTypeIndex >= 0 && ProductTypeIndex < ProductTypesSel.Length ? ProductTypesSel[ProductTypeIndex].Name : null;

Codebehind:

int indexValue = Array.IndexOf(_Model.ProductTypesSel, productValue);
_Model.ProductTypeIndex = indexValue;

CodePudding user response：

because you are searching by value value3, not by Value3. your array has Value3. and arrays don't find by case insensitive.

for case insensitive search you can use this

string[] arr = new string[] { "Value0", "Value1", "Value2", "Value3", "Value4", "Value5" };
int index = Array.FindIndex(arr, t => t.IndexOf("value3", StringComparison.InvariantCultureIgnoreCase) >= 0);

CodePudding user response：

At first, please make sure the property Name in the ProductType is public, such as:

public class ProductType
{
  public string Name {get;set;}
}

And then you can try to use the Array.FindIndex:

int index = Array.FindIndex(_Model.ProductTypesSel, t => t.Name ==productValue);
// or use the code below
int i=  Array.IndexOf(_Model.ProductTypesSel,  _Model.ProductTypesSel.Where(x=>x.Name==productValue).FirstOrDefault());

For more information, you can check this link.