在angularjs控制器的打字稿代码中处理$ scope

在$ scope和$ mdDialog是静态的情况下，以下工作。

declare var module: any;
export interface IChangePassword extends ng.IScope {
    cancel: Function;
    myname: string;
    state: string;
    processRequest: Function;
    CurrentPassword: string;
    NewPassword: string;
    ConfirmPassword: string;
}

export class ChangePasswordController {
    static $inject = ["$scope", "$mdDialog","$timeout"];
    static $mdDialog: any;
    static $timeout: any;
    state: string = 'getInput';
    static $scope: IChangePassword;
    CurrentPassword: string;
    NewPassword: string;
    ConfirmPassword: string;
    ChangePasswordService: any;

    constructor($scope: IChangePassword, $mdDialog: any, $timeout: any) {
        ChangePasswordController.$mdDialog = $mdDialog;
        ChangePasswordController.$scope = $scope;
        $scope.state = this.state;
        $scope.cancel = this.cancel;
        $scope.processRequest = this.processRequest;
       //this.ChangePasswordService = ChangePasswordService;
        ChangePasswordController.$timeout = $timeout;
    }

   public cancel ():void {
        ChangePasswordController.$mdDialog.cancel();
    };

    public processRequest(): void {
        ChangePasswordController.$scope.state = 'processRequest';
        ChangePasswordController.$timeout(function () {
            ChangePasswordController.$scope.state = 'Done';
        }, 5000);

    }


}

module.exports = function (app) {
    app.controller("ChangePasswordController", ChangePasswordController);
}

以下无效。在processRequest（）中，对象this。$ scope始终为null。请帮忙。

export class ChangePasswordController {
    static $inject = ["$scope", "$mdDialog","$timeout"];
    static $mdDialog: any;
    static $timeout: any;
    state: string = 'getInput';
    $scope: IChangePassword;
    CurrentPassword: string;
    NewPassword: string;
    ConfirmPassword: string;
    ChangePasswordService: any;
    //myname: string = 'gaurav';
    constructor($scope: IChangePassword, $mdDialog: any, $timeout: any) {
        ChangePasswordController.$mdDialog = $mdDialog;
        this.$scope = $scope;
        $scope.state = this.state;
        $scope.cancel = this.cancel;
        $scope.processRequest = this.processRequest;
       //this.ChangePasswordService = ChangePasswordService;
        ChangePasswordController.$timeout = $timeout;
    }

   public cancel ():void {
        ChangePasswordController.$mdDialog.cancel();
    };

    public processRequest(): void {
        this.$scope.state = 'processRequest';
        ChangePasswordController.$timeout(function () {
            this.state = 'Done';
        }, 5000);

    }


}

module.exports = function (app) {
    app.controller("ChangePasswordController", ChangePasswordController);
}

我不确定为什么$ scope无法用作实例变量。在这段代码中。请让我知道是否有编写此代码的更好方法。

谢谢