具有DataGrid的WPF应用程序中的C＃Searchbox

Question

嗨，我在该网站上进行搜索，但没有找到关于我的问题的答案。 我读了这篇文章： http : //davidowens.wordpress.com/2009/02/18/wpf-search-text-box/ ，这是有人对wpf搜索框有另一个疑问的建议。 我有一个使用Access DB的C＃WPF应用程序。 在我的数据输入屏幕上，我有一个搜索框和一个数据网格，用于显示数据库中的所有记录。 我目前进行的搜索有效，但不符合我的预期。 我希望用户能够开始在搜索框中键入内容，并且数据网格中显示的记录列表将开始根据其键入内容进行过滤。 我想写的代码可以做到这一点，但是为了使他们能够进行搜索，他们必须例如输入：people *然后按回车，它将显示结果。 我想知道是否有一种方法可以修改我的代码，而不需要输入星号并在输入时进行过滤，还是应该以不同的方式编写？ 我的数据输入xaml页面的文本框名称如下：

<TextBox x:Name="txtSearch" Grid.Column="1" FontSize="14" Margin="10, 0, 10, 0" Text="{Binding Path=SearchString,Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" />

在下面的我的datahelper.cs上：

    private void Search(string inputSearchString)
    {
        inputSearchString = inputSearchString.ToLower();

        LastSearchTerm = inputSearchString;

        FilteredCaseCollection.Clear();

        if (String.IsNullOrEmpty(inputSearchString.Trim()))
        {
            foreach (CaseViewModel caseVM in CaseCollection)
            {
                FilteredCaseCollection.Add(caseVM);
            }
        }
        else
        {
            inputSearchString = inputSearchString.Replace(" =", "=").Replace("= ", "=").Replace(" = ", "=");

            string[] termsArray = inputSearchString.Split(' ');

            int count = 0;

            foreach (CaseViewModel caseVM in CaseCollection)
            {
                count++;
                Type t = caseVM.GetType();
                foreach (PropertyInfo propertyInfo in t.GetProperties())
                {
                    if (propertyInfo.CanRead)
                    {
                        object value = propertyInfo.GetValue(caseVM, null);

                        if (value == null)
                        {
                            value = String.Empty;
                        }

                        string name = propertyInfo.Name.ToLower();

                        foreach (string term in termsArray)
                        {
                            if (term.ToLower().Equals(value.ToString().ToLower()))
                            {
                                if (!FilteredCaseCollection.Contains(caseVM))
                                {
                                    FilteredCaseCollection.Add(caseVM);
                                }
                            }
                            else if (term.ToLower().Contains("*") && MatchWildcardString(term.ToLower(), value.ToString().ToLower()))
                            {
                                if (!FilteredCaseCollection.Contains(caseVM))
                                {
                                    FilteredCaseCollection.Add(caseVM);
                                }
                            }
                        }
                    }
                }
            }
        }
    }

    public bool MatchWildcardString(string pattern, string input)
    {
        if (String.Compare(pattern, input) == 0)
        {
            return true;
        }
        else if (String.IsNullOrEmpty(input))
        {
            if (String.IsNullOrEmpty(pattern.Trim(new Char[1] { '*' })))
            {
                return true;
            }
            else
            {
                return false;
            }
        }
        else if (pattern.Length == 0)
        {
            return false;
        }
        else if (pattern[0] == '?')
        {
            return MatchWildcardString(pattern.Substring(1), input.Substring(1));
        }
        else if (pattern[pattern.Length - 1] == '?')
        {
            return MatchWildcardString(pattern.Substring(0, pattern.Length - 1), input.Substring(0, input.Length - 1));
        }
        else if (pattern[0] == '*')
        {
            if (MatchWildcardString(pattern.Substring(1), input))
            {
                return true;
            }
            else
            {
                return MatchWildcardString(pattern, input.Substring(1));
            }
        }
        else if (pattern[pattern.Length - 1] == '*')
        {
            if (MatchWildcardString(pattern.Substring(0, pattern.Length - 1), input))
            {
                return true;
            }
            else
            {
                return MatchWildcardString(pattern, input.Substring(0, input.Length - 1));
            }
        }
        else if (pattern[0] == input[0])
        {
            return MatchWildcardString(pattern.Substring(1), input.Substring(1));
        }
        return false;
    }

Answer 1

这需要完全匹配

if (term.ToLower().Equals(value.ToString().ToLower()))

将其更改为“ StartsWidth”可以解决问题。

if (value.ToString().ToLower().StartsWith(term.ToLower())

如果键入“ t”，则将匹配值为“ thursday”的属性。

或尝试Contains是否是您想要的。

if (value.ToString().ToLower().Contains(term.ToLower())

Answer 2

我整理了一下您正在做的事情的简单形式。 我在这里放置XAML和ViewModel。 我基本上创建了一个客户列表，然后将该列表复制到一个过滤列表中。 然后，我将DataGrid绑定到过滤列表。

<Grid x:Name="LayoutRoot">
    <Grid.RowDefinitions>
        <RowDefinition/>
        <RowDefinition/>
    </Grid.RowDefinitions>

    <TextBox x:Name="txtSearch" Grid.Row="0" FontSize="14" Margin="10, 0, 10, 0" Height="28" Width="74"
             Text="{Binding Path=SearchString, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" />

    <DataGrid Grid.Row="1" AutoGenerateColumns="True" ItemsSource="{Binding FilteredClients, Mode=TwoWay}" SelectedItem="{Binding SelectedClient}" />
</Grid>

    public class MainViewModel : ViewModelBase
{
    public MainViewModel(IDataService dataService)
    {
        allClients = new List<Client>();
        filteredClients = new List<Client>();
        GetAll();
    }


    public const string SearchStringPropertyName = "SearchString";
    private string searchString = string.Empty;
    public string SearchString
    {
        get
        {
            return searchString;
        }

        set
        {
            if (searchString == value)
            {
                return;
            }

            searchString = value;
            if (searchString == string.Empty)
            {
                filteredClients = allClients;
            }
            else
            {
                FilterAll();
            }
            RaisePropertyChanged(FilteredClientsPropertyName);
            RaisePropertyChanged(SearchStringPropertyName);
        }
    }

    public const string AllClientsPropertyName = "AllClients";
    private List<Client> allClients;
    public List<Client> AllClients
    {
        get
        {
            return allClients;
        }

        set
        {
            if (allClients == value)
            {
                return;
            }

            RaisePropertyChanging(AllClientsPropertyName);
            allClients = value;
            RaisePropertyChanged(AllClientsPropertyName);
        }
    }

    public const string FilteredClientsPropertyName = "FilteredClients";
    private List<Client> filteredClients;
    public List<Client> FilteredClients
    {
        get
        {
            return filteredClients;
        }

        set
        {
            if (filteredClients == value)
            {
                return;
            }

            RaisePropertyChanging(FilteredClientsPropertyName);
            filteredClients = value;
            RaisePropertyChanged(FilteredClientsPropertyName);
        }
    }

    public const string SelectedClientPropertyName = "SelectedClient";
    private Client selectedClient;
    public Client SelectedClient
    {
        get
        {
            return selectedClient;
        }

        set
        {
            if (selectedClient == value)
            {
                return;
            }

            RaisePropertyChanging(SelectedClientPropertyName);
            selectedClient = value;
            RaisePropertyChanged(SelectedClientPropertyName);
        }
    }

    private void GetAll()
    {
        AddClient("sally", "may", 10000);
        AddClient("bert", "benning", 10000);
        AddClient("ernie", "manning", 10000);
        AddClient("lisa", "ann", 10000);
        AddClient("michael", "douglas", 10000);
        AddClient("charlie", "sheen", 10000);

        filteredClients = allClients;
    }

    private void AddClient(String firstname, String lastname, Double salary)
    {
        Client clientadd = new Client();
        clientadd.FirstName = firstname;
        clientadd.LastName = lastname;
        clientadd.Salary = salary;

        allClients.Add(clientadd);
    }

    private void FilterAll()
    {
        filteredClients = (from c in allClients where c.FullName.Contains(searchString) orderby c.FullName select c).ToList();
    }

}

public class Client
{
    public String FirstName { get; set; }
    public String LastName { get; set; }
    public Double Salary { get; set; }
    public String FullName { get { return LastName + ", " + FirstName; } }

    public List<Client> Clients { get; set; }

}

我不需要星号，搜索非常简单。 我希望这有帮助。