Silverlight：MVVM 和重新初始化表单

发布于 2024-10-10 19:55:25 字数 1004 浏览 4 评论 0原文

我们使用 Prism，从网格中弹出一个编辑表单，其中有两个选项：“保存”和“保存并新建”。我的问题是关于重新初始化表单。我想知道是否有更好或更简单的方法？我所做的是在视图模型上公开 InteractionRequest，然后在 xaml 中使用 InteractionRequestTrigger 来更改表单的属性，如下所示：

private void SubmitAndNewCommandCallback(IEnumerable<ValidationResult> errors)
{
    if (errors != null && errors.Any())
    {
        Errors = errors.Select(x => x.ErrorMessage).ToList();
    }
    else
    {
        if (IsNew)
        {
            _events.GetEvent<BidAgentCreated>().Publish(this.BidAgent);
        }

        _intializeFormRequest.Raise(this);
    } 
}


<i:Interaction.Triggers>
    <prism:InteractionRequestTrigger SourceObject="{Binding InitializeFormRequest}"  >
        <ei:ChangePropertyAction TargetName="ctlAgentType" PropertyName="SelectedIndex" Value="0" />
        <ei:ChangePropertyAction TargetName="ctlAgentSearchBox" PropertyName="Text" Value=""/>
    </prism:InteractionRequestTrigger>
</i:Interaction.Triggers>

原文

We use Prism and from the grid we pop up a edit form that has two options, "Save" and "Save and New". My question is about re-initializing form. I am wondering if there is a better or simpler way? What I do is expose a InteractionRequest on the view model, and than use InteractionRequestTrigger in xaml to change the properties of the form, like this:

private void SubmitAndNewCommandCallback(IEnumerable<ValidationResult> errors)
{
    if (errors != null && errors.Any())
    {
        Errors = errors.Select(x => x.ErrorMessage).ToList();
    }
    else
    {
        if (IsNew)
        {
            _events.GetEvent<BidAgentCreated>().Publish(this.BidAgent);
        }

        _intializeFormRequest.Raise(this);
    } 
}


<i:Interaction.Triggers>
    <prism:InteractionRequestTrigger SourceObject="{Binding InitializeFormRequest}"  >
        <ei:ChangePropertyAction TargetName="ctlAgentType" PropertyName="SelectedIndex" Value="0" />
        <ei:ChangePropertyAction TargetName="ctlAgentSearchBox" PropertyName="Text" Value=""/>
    </prism:InteractionRequestTrigger>
</i:Interaction.Triggers>

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情话已封尘 2024-10-17 19:55:25

一种干净的方法是摆脱 View 中的逻辑并将其保留在 ViewModel 中。

xaml 中

<ComboBox ItemsSource="{Binding AgentTypes}" SelectedItem="{Binding SelectedAgentType,UpdateSourceTrigger=PropertyChanged,Mode=TwoWay}"/>
<TextBox Text="{Binding SearchText,UpdateSourceTrigger=PropertyChanged,Mode=TwoWay}" />

在 ViewModel 的

private void SubmitAndNewCommandCallback(IEnumerable<ValidationResult> errors)
{
    if (errors != null && errors.Any())
    {
        Errors = errors.Select(x => x.ErrorMessage).ToList();
    }
    else
    {
        if (IsNew)
        {
            _events.GetEvent<BidAgentCreated>().Publish(this.BidAgent);
        }

        SearchText="";
        SelectedAgentType = AgentTypes.First();  //selects first agenttype, or set to null to select nothing in the combobox

    } 
}

A clean way is to get rid of the logic in your View and keep it in the ViewModel.

in xaml

<ComboBox ItemsSource="{Binding AgentTypes}" SelectedItem="{Binding SelectedAgentType,UpdateSourceTrigger=PropertyChanged,Mode=TwoWay}"/>
<TextBox Text="{Binding SearchText,UpdateSourceTrigger=PropertyChanged,Mode=TwoWay}" />

in the ViewModel

private void SubmitAndNewCommandCallback(IEnumerable<ValidationResult> errors)
{
    if (errors != null && errors.Any())
    {
        Errors = errors.Select(x => x.ErrorMessage).ToList();
    }
    else
    {
        if (IsNew)
        {
            _events.GetEvent<BidAgentCreated>().Publish(this.BidAgent);
        }

        SearchText="";
        SelectedAgentType = AgentTypes.First();  //selects first agenttype, or set to null to select nothing in the combobox

    } 
}

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