UpdateSourceTrigger按钮单击转换器 [英] UpdateSourceTrigger button click Converter

问题描述

使用以下代码，在更新/更改DependencyProperties之一时，将调用Convert方法。

With the following code, the Convert method is being called when one of the DependencyProperties are being updated/changed.

我希望仅在单击按钮时才调用转换器。
我该怎么做？

I want the converter to be called only when the button is clicked. How can I do that?

这是代码：

 <Button Content="Create Project">

                <Button.CommandParameter>
                    <MultiBinding Converter="{StaticResource MyConverter}" UpdateSourceTrigger="Explicit"  Mode="TwoWay">
                        <Binding Path="Text" ElementName="txtDesc"/>
                        <Binding Path="Text" ElementName="txtName"/>
                        <Binding Path="SelectedItem" ElementName="ListBox"/>
                        <Binding Path="SelectedItem.Language" ElementName="TreeView"/>
                    </MultiBinding>
                </Button.CommandParameter>

            </Button>

推荐答案

我认为将纠正以下代码：

I think will correct something like this code:

xaml

 <Button Content="Create Project" Click="Button_Click"/>

cs

 private void Button_Click(object sender, RoutedEventArgs e)
    {
        string param1 = txtDesc.Text;
        string param2 = txtName.Text;
        object param3 = ListBox.SelectedItem;
        object param4 = TreeView.SelectedItem;

        object convertResult = MyConverterUtils.Convert(param1, param2, param3, param4);
        (sender as Button).CommandParameter = convertResult;
        //or you can execute some method here instead of set CommandParameter
    }


    public class MyConverterUtils 
    {
         //convert method
         //replace Object on your specific types 
         public static Object Convert(string param1, string param2,Object  param3,Object param4)
         {
             Object convertResult=null;

             //convert logic for params and set convertResult
             //for example convertResult = (param1 + param2).Trim();

             return convertResult;
         } 
    }

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