MVC html. renderpartial and HTML. Partial

① Html. Partial is the extension method of htmlhelper, while HTML. renderpartial is the built-in method of htmlhelper, which has similar functions. However

② Htm. Partial is to directly generate a string for the View content and return it (equivalent to an escape process ).

The HTML. renderpartial method outputs the data directly to the current httpcontext (because the data is directly output, the performance is good ).

③ The other three reloads of HTML. Partial and renderpartial are very useful. The second overload @ {html. renderpartial ("basicchart", model );}
With this overload, you can use a strong type in some views, and then use the second parameter in the main view to pass the model over, instead of using the Controller
For example, if one of the myclasses passed in the list
The third overload is used to pass viewdata. For example, @ {html. renderpartial ("basicchart", viewdata ["mydata"]);}

Supplement:

1. the return value of the method with render is void, which is output within the method. The return value type without render is mvchtmlstring. Therefore, you can only use the following method:
@ HTML. partial corresponds to @ {HTML. renderpartial (....);}
@ HTML. action corresponds to @ {HTML. renderaction (....);}
2. html. partial can directly provide the user control name as the parameter, while HTML. the action must have a corresponding action. In the action, partailresult (retun partialview () is returned ()).
3. html. Partial is recommended for simple user controls without any logic. html. Action is recommended for user controls that require some models. Of course, the HTML. Partial method can also be used for model data. You can refer to the method overload.
4. The advantage of using HTML. Action is that you can select different user controls based on different scenarios.
For example:
@ HTML. action ("userinfocontrol")
in the corresponding userinfocontrol action, you can retun partialview ("logonusercontrol") when the user is not logged on. After logging on, retun partialview ("userinfocontrol");