c# - ServiceStack 中的索引输入

Question

我正在开发一个服务基础设施和管理控制面板，两者都基于 ServiceStack(管理面板是 ServiceStack + Razor)。在管理 View 中，我创建了一个具有两个不同索引字段的表单:

<input name="StepName[]" />
<input name="StepDescription[]" />
<input name="StepDuration[]" />

<input name="IngredientName[]" />
<input name="IngredientQuantityName[]" />
<input name="IngredientQuantityValue[]" />

然后我写了管理员请求DTO:

public class StuffCreateRequest
{
    public string Name { get; set; }

    public string[] StepName { get; set; }
    public string[] StepDescription { get; set; }
    public int[] StepDuration { get; set; }

    public string[] IngredientName { get; set; }
    public string[] IngredientQuantityName { get; set; }
    public double[] IngredientQuantityValue { get; set; }
}

但是所有的数组属性都是空的。

问题是如何从这些字段中获取值？

附言实际上，知道如何从表单接收复合 DTO(带有列表、字典等)会更好吗？

Answer 1

我已经创建了一个完整的演示，演示如何处理从表单发布的集合数据。 ServiceStack 能够将表单数据转换为简单的集合，但无法处理复杂的结构，除非您使用 JSON 等数据类型。

为了解决这个问题，我会以更扁平的格式发布数据，然后让服务器将数据扩展为更结构化的格式，以便在您的代码中使用。

Full Source Code Here.

HTML 表单:

示例编辑器，显示多种成分和步骤。

结果:

显示从 HTML 表单发送的扩展的结构化数据。

---

方法:

在 HTML 中使用平面变量名:

即命名变量 StepName 而不是 StepName[]

<input type="text" name="StepName" value="1 - Prepare" />
...
<input type="text" name="StepName" value="2 - Mix" />

设置表单类型:

如果您使用的是自托管应用，我注意到如果没有明确的类型集，表单数据不会被填充。

<form action="/Recipes" method="POST" enctype="multipart/form-data">

设置您的 Request 对象以期待收集

[Route("/Recipes", "POST")]
public class CreateRecipeRequest : IReturn<Recipe>
{
    public string Name { get; set; }

    public string[] StepName { get; set; }
    public string[] StepDescription { get; set; }
    public int[] StepDuration { get; set; }

    public string[] IngredientName { get; set; }
    public string[] IngredientQuantityName { get; set; }
    public decimal[] IngredientQuantityValue { get; set; }
}

将扁平化请求转换为结构化配方:

public class Recipe
{
    public string Name { get; set; }
    public Ingredient[] Ingredients { get; set; }
    public Step[] Steps { get; set; }
}

public class Ingredient
{
    public string Name { get; set; }
    public string QuantityName { get; set; }
    public decimal Quantity { get; set; }
}

public class Step
{
    public string Name { get; set; }
    public string Description { get; set; }
    public int Duration { get; set; }
}

public class RecipeService : Service
{
    public Recipe Post(CreateRecipeRequest request)
    {
        // Convert the flat CreateRecipeRequest object to a structured Recipe object

        // Steps
        int numberOfSteps = request.StepName.Length;

        // Ingredients
        int numberOfIngredients = request.IngredientName.Length;

        // Check there is a description and duration for all steps
        if(request.StepDescription == null || request.StepDescription.Length != numberOfSteps || request.StepDuration == null || request.StepDuration.Length != numberOfSteps)
            throw new Exception("There must be a duration and description for all steps");

        // Create the Recipe object
        var recipe = new Recipe { Name = request.Name, Steps = new Step[numberOfSteps], Ingredients = new Ingredient[numberOfIngredients] };
        for(int s = 0; s < numberOfSteps; s++)
            recipe.Steps[s] = new Step { Name = request.StepName[s], Description = request.StepDescription[s], Duration = request.StepDuration[s] };

        // Check there is a quantity type and quantity value for all ingredients
        if(request.IngredientQuantityName == null || request.IngredientQuantityName.Length != numberOfIngredients || request.IngredientQuantityValue == null || request.IngredientQuantityValue.Length != numberOfIngredients)
            throw new Exception("The quantity must be provided for each ingredient");

        for(int i = 0; i < numberOfIngredients; i++)
            recipe.Ingredients[i] = new Ingredient { Name = request.IngredientName[i], QuantityName = request.IngredientQuantityName[i], Quantity = request.IngredientQuantityValue[i] };

        /*
         * Recipe can now be accessed through a logical collection:
         * 
         * recipe.Name
         * recipe.Steps[0].Name
         * recipe.Ingredients[1].Quantity
         * 
         */

        return recipe;
    }
}