【Autofac打标签模式】AutoConfiguration和Bean

【 Autofac打标签模式】开源DI框架扩展地址：

https://github.com/yuzd/Autofac.Annotation/wiki

*:first-child {
margin-top: 0 !important;
}

.markdown-body>*:last-child {
margin-bottom: 0 !important;
}

.markdown-body a:not([href]) {
color: inherit;
text-decoration: none;
}

.markdown-body .anchor {
float: left;
padding-right: 4px;
margin-left: -20px;
line-height: 1;
}

.markdown-body .anchor:focus {
outline: none;
}

.markdown-body p,
.markdown-body blockquote,
.markdown-body ul,
.markdown-body ol,
.markdown-body dl,
.markdown-body table,
.markdown-body pre {
margin-top: 0;
margin-bottom: 16px;
}

.markdown-body hr {
height: 0.25em;
padding: 0;
margin: 24px 0;
background-color: #e1e4e8;
border: 0;
}

.markdown-body blockquote {
padding: 0 1em;
color: #6a737d;
border-left: 0.25em solid #dfe2e5;
}

.markdown-body blockquote>:first-child {
margin-top: 0;
}

.markdown-body blockquote>:last-child {
margin-bottom: 0;
}

.markdown-body kbd {
display: inline-block;
padding: 3px 5px;
font-size: 11px;
line-height: 10px;
color: #444d56;
vertical-align: middle;
background-color: #fafbfc;
border: solid 1px #c6cbd1;
border-bottom-color: #959da5;
border-radius: 3px;
box-shadow: inset 0 -1px 0 #959da5;
}

.markdown-body h1,
.markdown-body h2,
.markdown-body h3,
.markdown-body h4,
.markdown-body h5,
.markdown-body h6 {
margin-top: 24px;
margin-bottom: 16px;
font-weight: 600;
line-height: 1.25;
}

.markdown-body h1 .octicon-link,
.markdown-body h2 .octicon-link,
.markdown-body h3 .octicon-link,
.markdown-body h4 .octicon-link,
.markdown-body h5 .octicon-link,
.markdown-body h6 .octicon-link {
color: #1b1f23;
vertical-align: middle;
visibility: hidden;
}

.markdown-body h1:hover .anchor,
.markdown-body h2:hover .anchor,
.markdown-body h3:hover .anchor,
.markdown-body h4:hover .anchor,
.markdown-body h5:hover .anchor,
.markdown-body h6:hover .anchor {
text-decoration: none;
}

.markdown-body h1:hover .anchor .octicon-link,
.markdown-body h2:hover .anchor .octicon-link,
.markdown-body h3:hover .anchor .octicon-link,
.markdown-body h4:hover .anchor .octicon-link,
.markdown-body h5:hover .anchor .octicon-link,
.markdown-body h6:hover .anchor .octicon-link {
visibility: visible;
}

.markdown-body h1 {
padding-bottom: 0.3em;
font-size: 2em;
border-bottom: 1px solid #eaecef;
}

.markdown-body h2 {
padding-bottom: 0.3em;
font-size: 1.5em;
border-bottom: 1px solid #eaecef;
}

.markdown-body h3 {
font-size: 1.25em;
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.markdown-body h4 {
font-size: 1em;
}

.markdown-body h5 {
font-size: 0.875em;
}

.markdown-body h6 {
font-size: 0.85em;
color: #6a737d;
}

.markdown-body ul,
.markdown-body ol {
padding-left: 2em;
}

.markdown-body ul ul,
.markdown-body ul ol,
.markdown-body ol ol,
.markdown-body ol ul {
margin-top: 0;
margin-bottom: 0;
}

.markdown-body li {
word-wrap: break-all;
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.markdown-body li>p {
margin-top: 16px;
}

.markdown-body li+li {
margin-top: 0.25em;
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.markdown-body dl {
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.markdown-body dl dt {
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margin-top: 16px;
font-size: 1em;
font-style: italic;
font-weight: 600;
}

.markdown-body dl dd {
padding: 0 16px;
margin-bottom: 16px;
}

.markdown-body table {
display: block;
width: 100%;
overflow: auto;
}

.markdown-body table th {
font-weight: 600;
}

.markdown-body table th,
.markdown-body table td {
padding: 6px 13px;
border: 1px solid #dfe2e5;
}

.markdown-body table tr {
background-color: #fff;
border-top: 1px solid #c6cbd1;
}

.markdown-body table tr:nth-child(2n) {
background-color: #f6f8fa;
}

.markdown-body img {
max-width: 100%;
box-sizing: content-box;
background-color: #fff;
}

.markdown-body img[align=right] {
padding-left: 20px;
}

.markdown-body img[align=left] {
padding-right: 20px;
}

.markdown-body code {
padding: 0.2em 0.4em;
margin: 0;
font-size: 85%;
background-color: rgba(27,31,35,0.05);
border-radius: 3px;
}

.markdown-body pre {
word-wrap: normal;
}

.markdown-body pre>code {
padding: 0;
margin: 0;
font-size: 100%;
word-break: normal;
white-space: pre;
background: transparent;
border: 0;
}

.markdown-body .highlight {
margin-bottom: 16px;
}

.markdown-body .highlight pre {
margin-bottom: 0;
word-break: normal;
}

.markdown-body .highlight pre,
.markdown-body pre {
padding: 16px;
overflow: auto;
font-size: 85%;
line-height: 1.45;
background-color: #f6f8fa;
border-radius: 3px;
}

.markdown-body pre code {
display: inline;
max-width: auto;
padding: 0;
margin: 0;
overflow: visible;
line-height: inherit;
word-wrap: normal;
background-color: transparent;
border: 0;
}

.markdown-body .full-commit .btn-outline:not(:disabled):hover {
color: #005cc5;
border-color: #005cc5;
}

.markdown-body kbd {
display: inline-block;
padding: 3px 5px;
font: 11px "SFMono-Regular", Consolas, "Liberation Mono", Menlo, Courier, monospace;
line-height: 10px;
color: #444d56;
vertical-align: middle;
background-color: #fafbfc;
border: solid 1px #d1d5da;
border-bottom-color: #c6cbd1;
border-radius: 3px;
box-shadow: inset 0 -1px 0 #c6cbd1;
}

.markdown-body :checked+.radio-label {
position: relative;
z-index: 1;
border-color: #0366d6;
}

.markdown-body .task-list-item {
list-style-type: none;
}

.markdown-body .task-list-item+.task-list-item {
margin-top: 3px;
}

.markdown-body .task-list-item input {
margin: 0 0.2em 0.25em -1.6em;
vertical-align: middle;
}

.markdown-body hr {
border-bottom-color: #eee;
}

/*

github.com style (c) Vasily Polovnyov

*/

.hljs {
display: block;
overflow-x: auto;
padding: 0.5em;
color: #333;
background: #f8f8f8;
}

.hljs-comment,
.hljs-quote {
color: #998;
font-style: italic;
}

.hljs-keyword,
.hljs-selector-tag,
.hljs-subst {
color: #333;
font-weight: bold;
}

.hljs-number,
.hljs-literal,
.hljs-variable,
.hljs-template-variable,
.hljs-tag .hljs-attr {
color: #008080;
}

.hljs-string,
.hljs-doctag {
color: #d14;
}

.hljs-title,
.hljs-section,
.hljs-selector-id {
color: #900;
font-weight: bold;
}

.hljs-subst {
font-weight: normal;
}

.hljs-type,
.hljs-class .hljs-title {
color: #458;
font-weight: bold;
}

.hljs-tag,
.hljs-name,
.hljs-attribute {
color: #000080;
font-weight: normal;
}

.hljs-regexp,
.hljs-link {
color: #009926;
}

.hljs-symbol,
.hljs-bullet {
color: #990073;
}

.hljs-built_in,
.hljs-builtin-name {
color: #0086b3;
}

.hljs-meta {
color: #999;
font-weight: bold;
}

.hljs-deletion {
background: #fdd;
}

.hljs-addition {
background: #dfd;
}

.hljs-emphasis {
font-style: italic;
}

.hljs-strong {
font-weight: bold;
}

/* Flowchart variables */
/* Sequence Diagram variables */
/* Gantt chart variables */
.mermaid .label {
color: #333;
}
.node rect,
.node circle,
.node ellipse,
.node polygon {
fill: #ECECFF;
stroke: #CCCCFF;
stroke-width: 1px;
}
.edgePath .path {
stroke: #333333;
}
.edgeLabel {
background-color: #e8e8e8;
}
.cluster rect {
fill: #ffffde !important;
rx: 4 !important;
stroke: #aaaa33 !important;
stroke-width: 1px !important;
}
.cluster text {
fill: #333;
}
.actor {
stroke: #CCCCFF;
fill: #ECECFF;
}
text.actor {
fill: black;
stroke: none;
}
.actor-line {
stroke: grey;
}
.messageLine0 {
stroke-width: 1.5;
stroke-dasharray: "2 2";
marker-end: "url(#arrowhead)";
stroke: #333;
}
.messageLine1 {
stroke-width: 1.5;
stroke-dasharray: "2 2";
stroke: #333;
}
#arrowhead {
fill: #333;
}
#crosshead path {
fill: #333 !important;
stroke: #333 !important;
}
.messageText {
fill: #333;
stroke: none;
}
.labelBox {
stroke: #CCCCFF;
fill: #ECECFF;
}
.labelText {
fill: black;
stroke: none;
}
.loopText {
fill: black;
stroke: none;
}
.loopLine {
stroke-width: 2;
stroke-dasharray: "2 2";
marker-end: "url(#arrowhead)";
stroke: #CCCCFF;
}
.note {
stroke: #aaaa33;
fill: #fff5ad;
}
.noteText {
fill: black;
stroke: none;
font-family: 'trebuchet ms', verdana, arial;
font-size: 14px;
}
/** Section styling */
.section {
stroke: none;
opacity: 0.2;
}
.section0 {
fill: rgba(102, 102, 255, 0.49);
}
.section2 {
fill: #fff400;
}
.section1,
.section3 {
fill: white;
opacity: 0.2;
}
.sectionTitle0 {
fill: #333;
}
.sectionTitle1 {
fill: #333;
}
.sectionTitle2 {
fill: #333;
}
.sectionTitle3 {
fill: #333;
}
.sectionTitle {
text-anchor: start;
font-size: 11px;
text-height: 14px;
}
/* Grid and axis */
.grid .tick {
stroke: lightgrey;
opacity: 0.3;
shape-rendering: crispEdges;
}
.grid path {
stroke-width: 0;
}
/* Today line */
.today {
fill: none;
stroke: red;
stroke-width: 2px;
}
/* Task styling */
/* Default task */
.task {
stroke-width: 2;
}
.taskText {
text-anchor: middle;
font-size: 11px;
}
.taskTextOutsideRight {
fill: black;
text-anchor: start;
font-size: 11px;
}
.taskTextOutsideLeft {
fill: black;
text-anchor: end;
font-size: 11px;
}
/* Specific task settings for the sections*/
.taskText0,
.taskText1,
.taskText2,
.taskText3 {
fill: white;
}
.task0,
.task1,
.task2,
.task3 {
fill: #8a90dd;
stroke: #534fbc;
}
.taskTextOutside0,
.taskTextOutside2 {
fill: black;
}
.taskTextOutside1,
.taskTextOutside3 {
fill: black;
}
/* Active task */
.active0,
.active1,
.active2,
.active3 {
fill: #bfc7ff;
stroke: #534fbc;
}
.activeText0,
.activeText1,
.activeText2,
.activeText3 {
fill: black !important;
}
/* Completed task */
.done0,
.done1,
.done2,
.done3 {
stroke: grey;
fill: lightgrey;
stroke-width: 2;
}
.doneText0,
.doneText1,
.doneText2,
.doneText3 {
fill: black !important;
}
/* Tasks on the critical line */
.crit0,
.crit1,
.crit2,
.crit3 {
stroke: #ff8888;
fill: red;
stroke-width: 2;
}
.activeCrit0,
.activeCrit1,
.activeCrit2,
.activeCrit3 {
stroke: #ff8888;
fill: #bfc7ff;
stroke-width: 2;
}
.doneCrit0,
.doneCrit1,
.doneCrit2,
.doneCrit3 {
stroke: #ff8888;
fill: lightgrey;
stroke-width: 2;
cursor: pointer;
shape-rendering: crispEdges;
}
.doneCritText0,
.doneCritText1,
.doneCritText2,
.doneCritText3 {
fill: black !important;
}
.activeCritText0,
.activeCritText1,
.activeCritText2,
.activeCritText3 {
fill: black !important;
}
.titleText {
text-anchor: middle;
font-size: 18px;
fill: black;
}
/*

*/
.node text {
font-family: 'trebuchet ms', verdana, arial;
font-size: 14px;
}
div.mermaidTooltip {
position: absolute;
text-align: center;
max-width: 200px;
padding: 2px;
font-family: 'trebuchet ms', verdana, arial;
font-size: 12px;
background: #ffffde;
border: 1px solid #aaaa33;
border-radius: 2px;
pointer-events: none;
z-index: 100;
}

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.success > p:last-child,
.info > p:last-child,
.warning > p:last-child,
.danger > p:last-child {
margin-bottom: 0;
}
.success {
color: #3c763d;
background-color: #dff0d8;
border-color: #d6e9c6;
}
.info {
color: #31708f;
background-color: #d9edf7;
border-color: #bce8f1;
}
.warning {
color: #8a6d3b;
background-color: #fcf8e3;
border-color: #faebcc;
}
.danger {
color: #a94442;
background-color: #f2dede;
border-color: #ebccd1;
}
abbr[title] {
cursor: help;
border-bottom: 1px dotted #777;
}
ul.table-of-contents {
list-style-type: none;
}
ul.table-of-contents li {
margin: 4px 0;
}
.markdown-body table {
width: auto;
display: table;
}
.markdown-body table td {
word-break: break-all;
}
.markdown-body.ace_search .highlight pre,
.markdown-body.ace_search pre {
overflow: visible !important;
width: -webkit-fit-content !important;
width: fit-content !important;
}
-->

让一个配置类去注册一些单例对象到DI容器内

• 打了AutoConfiguration标签的Class就是配置类
• 在AutoConfiguration标签的Class里面打了Bean标签的返回对象就是要注册的单例对象

原理解释：

框架会扫描打了【AutoConfiguration】的class，然后会再扫描打了【Bean】标签的方法并且Invoke该方法，拿到方法返回的对象并以单例的形式注册到DI容器中！

AutoConfiguration标签支持下面几个参数配置

• Key：如果指定key
• OrderIndex：值越大越先处理

Key的使用方法请查看下面的实例代码的注释

    //这个会加载
    [AutoConfiguration("Test")]
    public class MyConfig
    {
        [Bean]
        public MyModel GetMyModel()
        {
            return new MyModel
            {
                Name = "yuzd"
            };
        }
    }

    //这个不会被加载
    [AutoConfiguration("Prod")]
    public class MyConfig2
    {
        [Bean]
        public MyModel GetMyModel()
        {
            return new MyModel
            {
                Name = "yuzd"
            };
        }
    }

    // autofac打标签模式 并且调用了 SetAutofacConfigurationKey方法 指定了 Key 为 “Test”
    // 所有只会加载 打了且指定了Key=“Test”的AutoConfiguration标签class
    builder.RegisterModule(new AutofacAnnotationModule(typeof(MyConfig).Assembly).SetAutofacConfigurationKey("Test"));

    //这个会加载
    [AutoConfiguration]
    public class MyConfig
    {
        [Bean]
        public MyModel GetMyModel()
        {
            return new MyModel
            {
                Name = "yuzd"
            };
        }
    }

    //这个会被加载
    [AutoConfiguration]
    public class MyConfig2
    {
        [Bean]
        public MyModel GetMyModel()
        {
            return new MyModel
            {
                Name = "yuzd"
            };
        }
    }

    // autofac打标签模式
    // 没有指定Key 所以 上面2个都会加载
    builder.RegisterModule(new AutofacAnnotationModule(typeof(MyConfig).Assembly));

Bean标签的方法的参数支持注入DI已存在的，或者Value标签

        //方法的参数支持注入DI已存在的，或者Value标签
        [Bean]
        public MyModel GetMyModel(OtherClass other,[Value("${connetionString}")] connetionString)
        {
            return new MyModel
            {
                Name = "yuzd"
            };
        }

在业务代码里面的使用场景

1. 使用Key指定可以实现不同的环境配置不同的对象到DI容器
2. 一些复杂的对象实例可以使用Bean的方式注册的DI容器