如何获取 DataGrid 上显示的属性列？

Question

我有一个只显示类的某些属性的 DataGrid。

我想做的是，按列顺序获取绑定属性的列表，我该如何实现？

还有一件事，我只想要可见的列。

[编辑]

以下是我用来在类属性中搜索文本的内容，目前它搜索所有属性。

这将更改为仅搜索 DataGrid 上可见的属性

public static class FullTextSearch<T>
{

    public static bool Match(T item, string searchTerm)
    {
        bool match = _properties.Select(prop => prop(item)).Any(value => value != null && value.ToLower().Contains(searchTerm.ToLower()));
        return match;
    }

    private static List<Func<T, string>> _properties;

    public static void FullTextSearchInit()
    {
        _properties = GetPropertyFunctions().ToList();
    }

    public static IEnumerable<Func<T, string>> GetPropertyFunctions()
    {
        var stringProperties = GetStringPropertyFunctions();
        var intProperties = GetIntPropertyFunctions();
        var decimalProperties = GetDecimalPropertyFunctions();
        var dateTimeProperties = GetDateTimePropertyFunctions();
        return stringProperties.Concat(decimalProperties).Concat(intProperties).Concat(dateTimeProperties);
    }

    public static IEnumerable<Func<T, string>> GetStringPropertyFunctions()
    {
        var propertyInfos = typeof(T).GetProperties(BindingFlags.Public | BindingFlags.Instance | BindingFlags.GetProperty | BindingFlags.SetProperty)
            .Where(p => p.PropertyType == typeof(string)).ToList();

        var properties = propertyInfos.Select(GetStringPropertyFunc);
        return properties;
    }

    public static Func<T, string> GetStringPropertyFunc(PropertyInfo propInfo)
    {
        ParameterExpression x = System.Linq.Expressions.Expression.Parameter(typeof(T), "x");
        Expression<Func<T, string>> expression = System.Linq.Expressions.Expression.Lambda<Func<T, string>>(System.Linq.Expressions.Expression.Property(x, propInfo), x);
        Func<T, string> propertyAccessor = expression.Compile();
        return propertyAccessor;
    }

    public static IEnumerable<Func<T, string>> GetIntPropertyFunctions()
    {
        var propertyInfos = typeof(T).GetProperties(BindingFlags.Public | BindingFlags.Instance | BindingFlags.GetProperty | BindingFlags.SetProperty)
            .Where(p => p.PropertyType == typeof(int)).ToList();

        var properties = propertyInfos.Select(GetIntPropertyFunc);
        return properties;
    }

    public static Func<T, string> GetIntPropertyFunc(PropertyInfo propInfo)
    {
        ParameterExpression x = System.Linq.Expressions.Expression.Parameter(typeof(T), "x");
        Expression<Func<T, int>> expression = System.Linq.Expressions.Expression.Lambda<Func<T, int>>(System.Linq.Expressions.Expression.Property(x, propInfo), x);
        Func<T, int> propertyAccessor = expression.Compile();
        return (T item) => propertyAccessor(item).ToString();
    }

    public static IEnumerable<Func<T, string>> GetDecimalPropertyFunctions()
    {
        var propertyInfos = typeof(T).GetProperties(BindingFlags.Public | BindingFlags.Instance | BindingFlags.GetProperty | BindingFlags.SetProperty)
            .Where(p => p.PropertyType == typeof(decimal)).ToList();

        var properties = propertyInfos.Select(GetDecimalPropertyFunc);
        return properties;
    }

    public static Func<T, string> GetDecimalPropertyFunc(PropertyInfo propInfo)
    {
        ParameterExpression x = System.Linq.Expressions.Expression.Parameter(typeof(T), "x");
        Expression<Func<T, decimal>> expression = System.Linq.Expressions.Expression.Lambda<Func<T, decimal>>(System.Linq.Expressions.Expression.Property(x, propInfo), x);
        Func<T, decimal> propertyAccessor = expression.Compile();
        return (T item) => propertyAccessor(item).ToString();
    }

    public static IEnumerable<Func<T, string>> GetDateTimePropertyFunctions()
    {
        var propertyInfos = typeof(T).GetProperties(BindingFlags.Public | BindingFlags.Instance | BindingFlags.GetProperty | BindingFlags.SetProperty)
            .Where(p => p.PropertyType == typeof(DateTime)).ToList();

        var properties = propertyInfos.Select(GetDateTimePropertyFunc);
        return properties;
    }

    public static Func<T, string> GetDateTimePropertyFunc(PropertyInfo propInfo)
    {
        ParameterExpression x = System.Linq.Expressions.Expression.Parameter(typeof(T), "x");
        Expression<Func<T, DateTime>> expression = System.Linq.Expressions.Expression.Lambda<Func<T, DateTime>>(System.Linq.Expressions.Expression.Property(x, propInfo), x);
        Func<T, DateTime> propertyAccessor = expression.Compile();
        return (T item) => propertyAccessor(item).ToString();
    }
}

下面的代码是我如何称呼它的，它找到所有与搜索值匹配的属性并将项目添加到列表中，该列表被处理并添加到 DataGrid 上的 SelectedItems 属性中。

从长远来看，我想让这个通用性足以在任何 DataGrid 上使用。因此，不是搜索所有属性，而是需要更具体，如果我想提供下一个和上一个搜索功能，要转到下一个或上一个单元格匹配，我需要按照与 DataGrid 列匹配的顺序获取这些属性。

最终我想在调用时删除硬编码的类名：
FullTextSearch.FullTextSearchInit();
和
FullTextSearch.Match()
但这将是另一个问题

string sv = SearchValue;
this.Target.SelectedItems.Clear();

var itemsSource = this.Target.Items as IEnumerable;

List<Object> tempItems = new List<Object>();

FullTextSearch<UserViewModel>.FullTextSearchInit();

if (itemsSource != null)
{
    foreach (var item in itemsSource)
    {
        if (FullTextSearch<UserViewModel>.Match((UserViewModel)item, sv))
        {
            tempItems.Add(item);
        }
    }
    if (tempItems.Count > 0)
    {
        //Add found items to SelectedItems
    }
}

Answer 1

我不确定这是否有帮助：

var visibleColumns = grid.Columns.Where(c => c.Visibility == System.Windows.Visibility.Visible).ToList();