Question

有没有人对WPF Datagrid的跨行验证有任何示例。单元级别验证和行级验证不符合我的要求。我想尽可能地坚持使用MVVM。我的最后一个选择是使用代码。所以基本上我需要在网格中发生某些事情时访问Itemssource。任何帮助深表感谢。谢谢-Rey

Answer 1

在后面的代码中为每个表添加一个分部类。

如果没有错误，属性[HasNoError]返回true

属性[Error]将错误返回为字符串

if(tablename.HasNoError)
{
// do your logic
}
else
{
// display tablename.Error
}

在xaml端使用绑定

<DataGridTextColumn  Binding="{Binding Path=ActualFieldName1, ValidatesOnDataErrors=True, UpdateSourceTrigger=PropertyChanged }" Header=" ActualFieldName1"  />

这是使用IDataErrorInfo -

的类示例

public partial class tablename : IDataErrorInfo
{
    private Dictionary<string, string> errorCollection = new Dictionary<string, string>();
    public bool HasNoError
    {
        get
        {
            return string.IsNullOrWhiteSpace(Error);
        }
    }
    public string Error
    {
        get
        {
            if (errorCollection.Count == 0)
                return null;
            StringBuilder errorList = new StringBuilder();
            var errorMessages = errorCollection.Values.GetEnumerator();
            while (errorMessages.MoveNext())
                errorList.AppendLine(errorMessages.Current);
            return errorList.ToString();
        }
    }
    public string this[string fieldName]
    {
        get
        {
            string result = null;
            switch (fieldName)
            {
                case "ActualFieldName1":
                    if (string.IsNullOrWhiteSpace(this.ActualFieldName1))
                    {
                        result = "ActualFieldName1 is required.";
                    };
                     if (Other_Condition)
                    {
                        result = "Other Result";
                    };
                    break;
                case "ActualFieldName2":
                    if (string.IsNullOrWhiteSpace(this.ActualFieldName2))
                    {
                        result = "ActualFieldName2 is required.";
                    };
                    if (Other_Condition)
                    {
                        result = "Other Result";
                    };
                    break;
                    // and so
            }
            if (result != null && !errorCollection.ContainsKey(fieldName))
                errorCollection.Add(fieldName, result);
            if (result == null && errorCollection.ContainsKey(fieldName))
                errorCollection.Remove(fieldName);
            return result;
        }
    }
}

为了更好地添加一些样式来定位错误模板，请参阅示例

<Style TargetType="{x:Type TextBox}">
        <Setter Property="Validation.ErrorTemplate">
            <Setter.Value>
                <ControlTemplate>
                    <Border BorderBrush="Red" BorderThickness="1">
                        <Grid>
                            <AdornedElementPlaceholder x:Name="MyAdorner"/>
                            <Image Width="{Binding AdornedElement.ActualHeight, ElementName=MyAdorner}"  Margin="0" ToolTip="{Binding AdornedElement.(Validation.Errors)[0].ErrorContent, ElementName=MyAdorner}" HorizontalAlignment="Right"  VerticalAlignment="Center" Source="/Path/Exclamation.png" />
                        </Grid>
                    </Border>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>

WPF Datagrid跨行验证

1 个答案: