Question

I have a 2 lists that contain BreadCrumbItem object:

    public BreadcrumbItem()
    {
        this.Title = string.Empty;
        this.Url = string.Empty;
        this.BreadcrumbType = BreadcrumbType.None;
    }

public enum BreadcrumbType
{
    /// <summary>
    /// Used for None type.
    /// </summary>
    None,

    /// <summary>
    /// Used for Area breadcrumb.
    /// </summary>
    Area,

    /// <summary>
    /// Used for Controller breadcrumb.
    /// </summary>
    Controller,

    /// <summary>
    /// Used for Action breadcrumb.
    /// </summary>
    Action
}

I need to join these two lists However, I need to overwrite properties of List1 with properties of List2 (only to those items that have BreadcrumbType specified).

So for example:

var List1 = new List<BreadCrumbItem>()
List1.Add(new BreadcrumbItem(){ "List1Test1", "/home/", "Controller"});
List1.Add(new BreadcrumbItem(){ "List1Test2", "/view/", "Action"});
List1.Add(new BreadcrumbItem(){ "List1Test2", "/view/", null});

var List2 = new List<BreadCrumbItem>()
List2.Add(new BreadcrumbItem(){ "List2Test1", "/test/", "Controller"});
List2.Add(new BreadcrumbItem(){ "List2Test2", "/test3/", null});
List2.Add(new BreadcrumbItem(){ "List2Test3", "/test3/", null});

after the join I’m suppose to have a list that has the following items:

List2Test1
List1Test2
List1Test2
List2Test2
List2Test3

Order is important.

Please help.
thanks

Answer 1

I ended up not using LINQ:

            this.Items = new List<BreadcrumbItem>();
            foreach (var item in virtualPathData)
            {
                if (customBreadcrumbs != null)
                {
                    var replaceItem =
                        customBreadcrumbs.Items.FirstOrDefault(t => t.BreadcrumbType == item.BreadcrumbType);
                    if (replaceItem != null)
                    {
                        this.Items.Add(replaceItem);
                        customBreadcrumbs.Items.Remove(replaceItem);
                        continue;
                    }
                }

                this.Items.Add(item);                                        
            }
            if (customBreadcrumbs != null)
            {
                foreach (var breadcrumb in customBreadcrumbs.Items)
                {
                    this.Items.Add(
                        breadcrumb.Url.IndexOf("?") == 0
                            ? new BreadcrumbItem(
                                  breadcrumb.Title,
                                  string.Concat(this.Items.Last().Url, breadcrumb.Url),
                                  BreadcrumbType.None)
                            : breadcrumb);
                }

            }