**Summary of Web API Interface Design Experience**
1. **Determine Whether to Use GET or POST in Interface Definition**
Since our entire Web API platform is built on an MVC-based architecture, it's essential to explicitly declare whether an API endpoint uses `[HttpGet]` or `[HttpPost]`. Even if some interfaces might not strictly require it, failing to do so can lead to errors such as:
*"The requested resource does not support the HTTP method 'POST'."*
By clearly defining the HTTP method for each interface, we avoid confusion and ensure that the API behaves as expected. For example, when creating a basic lookup interface, you would define it like this:
```csharp
///
/// Query the database to check if an object with the specified ID exists.
///
/// ID of the object to find
/// Returns the object if found, otherwise returns null.
[HttpGet]
public virtual T FindByID(string id, string token)
```
For operations that involve inserting or updating data, such as adding a new record, the `POST` method is typically used. These interfaces often require more parameters for security reasons, like tokens, signatures, timestamps, and nonces.
```csharp
///
/// Insert the specified object into the database.
///
/// The object to insert
/// Returns true if successful.
[HttpPost]
public virtual CommonResult Insert(T info, string token, string signature, string timestamp, string nonce, string appid)
```
2. **Dynamic Object Interface Design**
In many cases, you may encounter APIs that require simple parameter types but still need to be submitted via POST. To handle this, there are two common approaches: either create a dedicated class to hold all parameters, or use a dynamic object such as `JObject` from the Newtonsoft.Json.Linq namespace. The latter approach is often preferred because it avoids the hassle of creating numerous small classes for every interface.
For instance, consider a scenario where you need to update a user’s password. Instead of defining a separate class for the request body, you can use a `JObject` to dynamically receive the data.
```csharp
///
/// Modify user password.
///
/// A dynamic object containing userName and userPassword
/// User access token
/// Returns the result of the operation.
[HttpPost]
public CommonResult ModifyPassword(JObject param, string token)
{
// Token validation
CheckResult checkResult = CheckToken(token);
dynamic obj = param;
if (obj != null)
{
string userName = obj.userName;
string userPassword = obj.userPassword;
bool success = BLLFactory.Instance.ModifyPassword(userName, userPassword);
return new CommonResult(success);
}
else
{
throw new MyApiException("Missing parameter");
}
}
```
When using `JObject`, you can dynamically access properties at runtime without needing to predefine a specific class. This makes the interface more flexible and easier to maintain.
On the client side, you can also generate the JSON payload dynamically using anonymous objects:
```csharp
public bool ModifyPassword(string userName, string userPassword)
{
var action = "ModifyPassword";
var postData = new
{
userName = userName,
userPassword = userPassword
}.ToJson();
string url = GetTokenUrl(action);
CommonResult result = JsonHelper.ConvertJson(url, postData);
return (result != null) ? result.Success : false;
}
```
This approach allows you to build and send JSON payloads on the fly, making your API calls more efficient and adaptable. It also simplifies the process of handling different types of requests without having to define multiple classes for each one.
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Market Landscape and Trends
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