尝试使用.net core处理Azure存储表操作。我已经成功添加了一个新的存储表，并使用唯一的rowKey插入了新行（我通过重新插入测试了插入，这给我带来了冲突，这意味着它已经有了一个键）。当我尝试使用已插入的rowKey = 1检索相同的键时，出现错误。
CloudStorageAccount cloudStorageAccount = CloudStorageAccount.Parse(StorageConnectionString);
//create storage table
CreateTable(cloudStorageAccount).GetAwaiter().GetResult();
InsertEntity(cloudStorageAccount).GetAwaiter().GetResult();
RetrieveEntity(cloudStorageAccount, "blog", "1").GetAwaiter().GetResult();
public static async Task RetrieveEntity(CloudStorageAccount cloudStorageAccount,
string partitionKey, string rowKey)
{
var cloudTableClient = cloudStorageAccount.CreateCloudTableClient();
var cloudTableReference = cloudTableClient.GetTableReference("MyAzureTableStorage");
TableOperation retrieve = TableOperation.Retrieve<BlogEntity>(partitionKey, rowKey);
var result = await cloudTableReference.ExecuteAsync(retrieve);
if(result.Result == null)
{
Console.WriteLine("Not able to find the results");
}
else
{
Console.WriteLine($"Blog found for author: {((BlogEntity)result.Result).Author}");
}
}
遇到错误：
Microsoft.WindowsAzure.Storage.StorageException
HResult=0x80131500
Message=No parameterless constructor defined for this object.
Source=Microsoft.WindowsAzure.Storage
StackTrace:
at Microsoft.WindowsAzure.Storage.Core.Executor.Executor. <ExecuteAsyncInternal>d__4`1.MoveNext()
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult()
at AzureTable.Program.<RetrieveEntity>d__3.MoveNext() in D:\Manish \Practice\AzureIt\AzureTable\Program.cs:line 46
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at AzureTable.Program.Main(String[] args) in D:\Manish\Practice\AzureIt\AzureTable\Program.cs:line 21
Inner Exception 1:
MissingMethodException: No parameterless constructor defined for this object.
BlogEntity类：
public class BlogEntity : TableEntity
{
public BlogEntity(int ID, string author, string title, string description)
{
this.UniqueID = ID;
this.Author = author;
this.Title = title;
this.Description = description;
this.PartitionKey = "blog";
this.RowKey = ID.ToString();
}
public int UniqueID { get; set; }
public string Author { get; set; }
public string Title { get; set; }
public string Description { get; set; }
}
答案 0 :(得分：1)
将无参数构造函数添加到$(document).ready(function(){
var arr = []; // List of users
//function to minimize the chat
$(document).on('click','.msg_head',function(){
var chatbox=$(this).parents().attr("rel");
$('[rel="'+chatbox+'"].msg_wrap').slideToggle('slow');
displayChatBox();
return false;
});
//function to close the chat
$(document).on('click', '.close', function() {
var chatbox = $(this).parents().parents().attr("rel") ;
$('[rel="'+chatbox+'"]').hide();
arr.splice($.inArray(chatbox, arr), 1);
displayChatBox();
return false;
});
// function for send button//
function sendMessage(e) {
/*$("#send_messagessage").addClass("disabled");
if(typeof e.type !== 'string' || (e.type == 'keyup' && e.keyCode != 13)) {
//return $('#status').html('no call');
return false;
}
$('#status').html('made call');*/
var msg = document.getElementById("text_msg").value;; //retrieve msg from text
if(msg.trim().length != 0){
var chatbox = $(this).parents().parents().parents().attr("rel") ;
$('<div class="msg-right">'+msg+'</div>').insertBefore('[rel="'+chatbox+'"] .msg_push');
$('.msg_body').scrollTop($('.msg_body')[0].scrollHeight);
var product = output(msg);
$('<div class="msg-left">'+product+'</div>').insertBefore('[rel="'+chatbox+'"] .msg_push');
$('.msg_body').scrollTop($('.msg_body')[0].scrollHeight);
}
};
$(document).on('click', '#sidebar-user-box', function() {
var userID = $(this).attr("class");
var username = $(this).children().text() ;
if ($.inArray(userID, arr) != -1)
{
arr.splice($.inArray(userID, arr), 1);
}
arr.unshift(userID);
chatPopup = '<div class="msg_box" rel="'+ userID+'">'+
'<div class="msg_head">'+username +
'<div class="close">X</div> </div>'+
'<div class="msg_wrap"> <div class="msg_body"> <div class="msg_push"></div> </div>'+
'<div class="msg_footer"><input class="msg_input" placeholder="Enter Message..." type="text"><button id="send_message" type="submit" >Send</button>'+
'</div></div></div>' ;
$("body").append( chatPopup );
displayChatBox();
});
$(document).on('keypress', 'input' , function(e) {
if (e.keyCode == 13 ) {
var msg = $(this).val();
$(this).val("");
if(msg.trim().length != 0){
var chatbox = $(this).parents().parents().parents().attr("rel") ;
$('<div class="msg-right">'+msg+'</div>').insertBefore('[rel="'+chatbox+'"] .msg_push');
$('.msg_body').scrollTop($('.msg_body')[0].scrollHeight);
var product = output(msg);
$('<div class="msg-left">'+product+'</div>').insertBefore('[rel="'+chatbox+'"] .msg_push');
$('.msg_body').scrollTop($('.msg_body')[0].scrollHeight);
}
}
});
function output(input){
try{
var product = input + "=" + eval(input);
} catch(e){
var text = (input.toLowerCase()).replace(/[^\w\s\d]/gi, ""); //remove all chars except words, space and
text = text.replace(/ a /g, " ").replace(/i feel /g, "").replace(/whats/g, "what is").replace(/please /g, "").replace(/ please/g, "");
if(compare(trigger, reply, text)){
var product = compare(trigger, reply, text);
} else {
var product = alternative[Math.floor(Math.random()*alternative.length)];
}
}
return product;
}
function compare(arr, array, string){
var item;
for(var x=0; x<arr.length; x++){
for(var y=0; y<array.length; y++){
if(arr[x][y] == string){
items = array[x];
item = items[Math.floor(Math.random()*items.length)];
}
}
}
return item;
}
function displayChatBox(){
i = 0 ; // start position
j = 260; //next position
$.each( arr, function( index, value ) {
if(index < 4){
$('[rel="'+value+'"]').css("right",i);
$('[rel="'+value+'"]').show();
i = i+j;
}
else{
$('[rel="'+value+'"]').hide();
}
});
}
});
类中可以解决此问题：
BlogEntity希望有帮助！