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<article class="content wrap" id="_content" data-uid="FreeSql.ISelectFromExpression`1">
<h1 id="FreeSql_ISelectFromExpression_1" data-uid="FreeSql.ISelectFromExpression`1" class="text-break">Interface ISelectFromExpression&lt;T1&gt;
</h1>
<div class="markdown level0 summary"></div>
<div class="markdown level0 conceptual"></div>
<h6><strong>Namespace</strong>: <a class="xref" href="FreeSql.html">FreeSql</a></h6>
<h6><strong>Assembly</strong>: FreeSql.dll</h6>
<h5 id="FreeSql_ISelectFromExpression_1_syntax">Syntax</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public interface ISelectFromExpression&lt;T1&gt;</code></pre>
</div>
<h5 class="typeParameters">Type Parameters</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Name</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><span class="parametername">T1</span></td>
<td></td>
</tr>
</tbody>
</table>
<h3 id="methods">Methods
</h3>
<span class="small pull-right mobile-hide">
<span class="divider">|</span>
<a href="https://github.com/dotnetcore/freesql/new/master/apiSpec/new?filename=FreeSql_ISelectFromExpression_1_InnerJoin_System_Linq_Expressions_Expression_System_Func__0_System_Boolean___.md&amp;value=---%0Auid%3A%20FreeSql.ISelectFromExpression%601.InnerJoin(System.Linq.Expressions.Expression%7BSystem.Func%7B%600%2CSystem.Boolean%7D%7D)%0Asummary%3A%20'*You%20can%20override%20summary%20for%20the%20API%20here%20using%20*MARKDOWN*%20syntax'%0A---%0A%0A*Please%20type%20below%20more%20information%20about%20this%20API%3A*%0A%0A">Improve this Doc</a>
</span>
<span class="small pull-right mobile-hide">
<a href="https://github.com/dotnetcore/FreeSql/blob/master/FreeSql/Interface/Curd/ISelect/ISelectFrom.cs/#L11">View Source</a>
</span>
<a id="FreeSql_ISelectFromExpression_1_InnerJoin_" data-uid="FreeSql.ISelectFromExpression`1.InnerJoin*"></a>
<h4 id="FreeSql_ISelectFromExpression_1_InnerJoin_System_Linq_Expressions_Expression_System_Func__0_System_Boolean___" data-uid="FreeSql.ISelectFromExpression`1.InnerJoin(System.Linq.Expressions.Expression{System.Func{`0,System.Boolean}})">InnerJoin(Expression&lt;Func&lt;T1, Boolean&gt;&gt;)</h4>
<div class="markdown level1 summary"></div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">ISelectFromExpression&lt;T1&gt; InnerJoin(Expression&lt;Func&lt;T1, bool&gt;&gt; exp)</code></pre>
</div>
<h5 class="parameters">Parameters</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Name</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><span class="xref">System.Linq.Expressions.Expression</span>&lt;<span class="xref">System.Func</span>&lt;T1, <span class="xref">System.Boolean</span>&gt;&gt;</td>
<td><span class="parametername">exp</span></td>
<td></td>
</tr>
</tbody>
</table>
<h5 class="returns">Returns</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><a class="xref" href="FreeSql.ISelectFromExpression-1.html">ISelectFromExpression</a>&lt;T1&gt;</td>
<td></td>
</tr>
</tbody>
</table>
<span class="small pull-right mobile-hide">
<span class="divider">|</span>
<a href="https://github.com/dotnetcore/freesql/new/master/apiSpec/new?filename=FreeSql_ISelectFromExpression_1_LeftJoin_System_Linq_Expressions_Expression_System_Func__0_System_Boolean___.md&amp;value=---%0Auid%3A%20FreeSql.ISelectFromExpression%601.LeftJoin(System.Linq.Expressions.Expression%7BSystem.Func%7B%600%2CSystem.Boolean%7D%7D)%0Asummary%3A%20'*You%20can%20override%20summary%20for%20the%20API%20here%20using%20*MARKDOWN*%20syntax'%0A---%0A%0A*Please%20type%20below%20more%20information%20about%20this%20API%3A*%0A%0A">Improve this Doc</a>
</span>
<span class="small pull-right mobile-hide">
<a href="https://github.com/dotnetcore/FreeSql/blob/master/FreeSql/Interface/Curd/ISelect/ISelectFrom.cs/#L10">View Source</a>
</span>
<a id="FreeSql_ISelectFromExpression_1_LeftJoin_" data-uid="FreeSql.ISelectFromExpression`1.LeftJoin*"></a>
<h4 id="FreeSql_ISelectFromExpression_1_LeftJoin_System_Linq_Expressions_Expression_System_Func__0_System_Boolean___" data-uid="FreeSql.ISelectFromExpression`1.LeftJoin(System.Linq.Expressions.Expression{System.Func{`0,System.Boolean}})">LeftJoin(Expression&lt;Func&lt;T1, Boolean&gt;&gt;)</h4>
<div class="markdown level1 summary"></div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">ISelectFromExpression&lt;T1&gt; LeftJoin(Expression&lt;Func&lt;T1, bool&gt;&gt; exp)</code></pre>
</div>
<h5 class="parameters">Parameters</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Name</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><span class="xref">System.Linq.Expressions.Expression</span>&lt;<span class="xref">System.Func</span>&lt;T1, <span class="xref">System.Boolean</span>&gt;&gt;</td>
<td><span class="parametername">exp</span></td>
<td></td>
</tr>
</tbody>
</table>
<h5 class="returns">Returns</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><a class="xref" href="FreeSql.ISelectFromExpression-1.html">ISelectFromExpression</a>&lt;T1&gt;</td>
<td></td>
</tr>
</tbody>
</table>
<span class="small pull-right mobile-hide">
<span class="divider">|</span>
<a href="https://github.com/dotnetcore/freesql/new/master/apiSpec/new?filename=FreeSql_ISelectFromExpression_1_OrderBy__1_System_Linq_Expressions_Expression_System_Func__0___0___.md&amp;value=---%0Auid%3A%20FreeSql.ISelectFromExpression%601.OrderBy%60%601(System.Linq.Expressions.Expression%7BSystem.Func%7B%600%2C%60%600%7D%7D)%0Asummary%3A%20'*You%20can%20override%20summary%20for%20the%20API%20here%20using%20*MARKDOWN*%20syntax'%0A---%0A%0A*Please%20type%20below%20more%20information%20about%20this%20API%3A*%0A%0A">Improve this Doc</a>
</span>
<span class="small pull-right mobile-hide">
<a href="https://github.com/dotnetcore/FreeSql/blob/master/FreeSql/Interface/Curd/ISelect/ISelectFrom.cs/#L34">View Source</a>
</span>
<a id="FreeSql_ISelectFromExpression_1_OrderBy_" data-uid="FreeSql.ISelectFromExpression`1.OrderBy*"></a>
<h4 id="FreeSql_ISelectFromExpression_1_OrderBy__1_System_Linq_Expressions_Expression_System_Func__0___0___" data-uid="FreeSql.ISelectFromExpression`1.OrderBy``1(System.Linq.Expressions.Expression{System.Func{`0,``0}})">OrderBy&lt;TMember&gt;(Expression&lt;Func&lt;T1, TMember&gt;&gt;)</h4>
<div class="markdown level1 summary"><p>按列排序OrderBy(a =&gt; a.Time)</p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">ISelectFromExpression&lt;T1&gt; OrderBy&lt;TMember&gt;(Expression&lt;Func&lt;T1, TMember&gt;&gt; column)</code></pre>
</div>
<h5 class="parameters">Parameters</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Name</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><span class="xref">System.Linq.Expressions.Expression</span>&lt;<span class="xref">System.Func</span>&lt;T1, TMember&gt;&gt;</td>
<td><span class="parametername">column</span></td>
<td></td>
</tr>
</tbody>
</table>
<h5 class="returns">Returns</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><a class="xref" href="FreeSql.ISelectFromExpression-1.html">ISelectFromExpression</a>&lt;T1&gt;</td>
<td></td>
</tr>
</tbody>
</table>
<h5 class="typeParameters">Type Parameters</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Name</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><span class="parametername">TMember</span></td>
<td></td>
</tr>
</tbody>
</table>
<span class="small pull-right mobile-hide">
<span class="divider">|</span>
<a href="https://github.com/dotnetcore/freesql/new/master/apiSpec/new?filename=FreeSql_ISelectFromExpression_1_OrderByDescending__1_System_Linq_Expressions_Expression_System_Func__0___0___.md&amp;value=---%0Auid%3A%20FreeSql.ISelectFromExpression%601.OrderByDescending%60%601(System.Linq.Expressions.Expression%7BSystem.Func%7B%600%2C%60%600%7D%7D)%0Asummary%3A%20'*You%20can%20override%20summary%20for%20the%20API%20here%20using%20*MARKDOWN*%20syntax'%0A---%0A%0A*Please%20type%20below%20more%20information%20about%20this%20API%3A*%0A%0A">Improve this Doc</a>
</span>
<span class="small pull-right mobile-hide">
<a href="https://github.com/dotnetcore/FreeSql/blob/master/FreeSql/Interface/Curd/ISelect/ISelectFrom.cs/#L40">View Source</a>
</span>
<a id="FreeSql_ISelectFromExpression_1_OrderByDescending_" data-uid="FreeSql.ISelectFromExpression`1.OrderByDescending*"></a>
<h4 id="FreeSql_ISelectFromExpression_1_OrderByDescending__1_System_Linq_Expressions_Expression_System_Func__0___0___" data-uid="FreeSql.ISelectFromExpression`1.OrderByDescending``1(System.Linq.Expressions.Expression{System.Func{`0,``0}})">OrderByDescending&lt;TMember&gt;(Expression&lt;Func&lt;T1, TMember&gt;&gt;)</h4>
<div class="markdown level1 summary"><p>按列倒向排序OrderByDescending(a =&gt; a.Time)</p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">ISelectFromExpression&lt;T1&gt; OrderByDescending&lt;TMember&gt;(Expression&lt;Func&lt;T1, TMember&gt;&gt; column)</code></pre>
</div>
<h5 class="parameters">Parameters</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Name</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><span class="xref">System.Linq.Expressions.Expression</span>&lt;<span class="xref">System.Func</span>&lt;T1, TMember&gt;&gt;</td>
<td><span class="parametername">column</span></td>
<td><p></p>
</td>
</tr>
</tbody>
</table>
<h5 class="returns">Returns</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><a class="xref" href="FreeSql.ISelectFromExpression-1.html">ISelectFromExpression</a>&lt;T1&gt;</td>
<td></td>
</tr>
</tbody>
</table>
<h5 class="typeParameters">Type Parameters</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Name</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><span class="parametername">TMember</span></td>
<td></td>
</tr>
</tbody>
</table>
<span class="small pull-right mobile-hide">
<span class="divider">|</span>
<a href="https://github.com/dotnetcore/freesql/new/master/apiSpec/new?filename=FreeSql_ISelectFromExpression_1_RightJoin_System_Linq_Expressions_Expression_System_Func__0_System_Boolean___.md&amp;value=---%0Auid%3A%20FreeSql.ISelectFromExpression%601.RightJoin(System.Linq.Expressions.Expression%7BSystem.Func%7B%600%2CSystem.Boolean%7D%7D)%0Asummary%3A%20'*You%20can%20override%20summary%20for%20the%20API%20here%20using%20*MARKDOWN*%20syntax'%0A---%0A%0A*Please%20type%20below%20more%20information%20about%20this%20API%3A*%0A%0A">Improve this Doc</a>
</span>
<span class="small pull-right mobile-hide">
<a href="https://github.com/dotnetcore/FreeSql/blob/master/FreeSql/Interface/Curd/ISelect/ISelectFrom.cs/#L12">View Source</a>
</span>
<a id="FreeSql_ISelectFromExpression_1_RightJoin_" data-uid="FreeSql.ISelectFromExpression`1.RightJoin*"></a>
<h4 id="FreeSql_ISelectFromExpression_1_RightJoin_System_Linq_Expressions_Expression_System_Func__0_System_Boolean___" data-uid="FreeSql.ISelectFromExpression`1.RightJoin(System.Linq.Expressions.Expression{System.Func{`0,System.Boolean}})">RightJoin(Expression&lt;Func&lt;T1, Boolean&gt;&gt;)</h4>
<div class="markdown level1 summary"></div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">ISelectFromExpression&lt;T1&gt; RightJoin(Expression&lt;Func&lt;T1, bool&gt;&gt; exp)</code></pre>
</div>
<h5 class="parameters">Parameters</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Name</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><span class="xref">System.Linq.Expressions.Expression</span>&lt;<span class="xref">System.Func</span>&lt;T1, <span class="xref">System.Boolean</span>&gt;&gt;</td>
<td><span class="parametername">exp</span></td>
<td></td>
</tr>
</tbody>
</table>
<h5 class="returns">Returns</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><a class="xref" href="FreeSql.ISelectFromExpression-1.html">ISelectFromExpression</a>&lt;T1&gt;</td>
<td></td>
</tr>
</tbody>
</table>
<span class="small pull-right mobile-hide">
<span class="divider">|</span>
<a href="https://github.com/dotnetcore/freesql/new/master/apiSpec/new?filename=FreeSql_ISelectFromExpression_1_Where_System_Linq_Expressions_Expression_System_Func__0_System_Boolean___.md&amp;value=---%0Auid%3A%20FreeSql.ISelectFromExpression%601.Where(System.Linq.Expressions.Expression%7BSystem.Func%7B%600%2CSystem.Boolean%7D%7D)%0Asummary%3A%20'*You%20can%20override%20summary%20for%20the%20API%20here%20using%20*MARKDOWN*%20syntax'%0A---%0A%0A*Please%20type%20below%20more%20information%20about%20this%20API%3A*%0A%0A">Improve this Doc</a>
</span>
<span class="small pull-right mobile-hide">
<a href="https://github.com/dotnetcore/FreeSql/blob/master/FreeSql/Interface/Curd/ISelect/ISelectFrom.cs/#L19">View Source</a>
</span>
<a id="FreeSql_ISelectFromExpression_1_Where_" data-uid="FreeSql.ISelectFromExpression`1.Where*"></a>
<h4 id="FreeSql_ISelectFromExpression_1_Where_System_Linq_Expressions_Expression_System_Func__0_System_Boolean___" data-uid="FreeSql.ISelectFromExpression`1.Where(System.Linq.Expressions.Expression{System.Func{`0,System.Boolean}})">Where(Expression&lt;Func&lt;T1, Boolean&gt;&gt;)</h4>
<div class="markdown level1 summary"><p>查询条件Where(a =&gt; a.Id &gt; 10)支持导航对象查询Where(a =&gt; a.Author.Email == &quot;2881099@qq.com&amp;quot;)</p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">ISelectFromExpression&lt;T1&gt; Where(Expression&lt;Func&lt;T1, bool&gt;&gt; exp)</code></pre>
</div>
<h5 class="parameters">Parameters</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Name</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><span class="xref">System.Linq.Expressions.Expression</span>&lt;<span class="xref">System.Func</span>&lt;T1, <span class="xref">System.Boolean</span>&gt;&gt;</td>
<td><span class="parametername">exp</span></td>
<td><p>lambda表达式</p>
</td>
</tr>
</tbody>
</table>
<h5 class="returns">Returns</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><a class="xref" href="FreeSql.ISelectFromExpression-1.html">ISelectFromExpression</a>&lt;T1&gt;</td>
<td></td>
</tr>
</tbody>
</table>
<span class="small pull-right mobile-hide">
<span class="divider">|</span>
<a href="https://github.com/dotnetcore/freesql/new/master/apiSpec/new?filename=FreeSql_ISelectFromExpression_1_WhereIf_System_Boolean_System_Linq_Expressions_Expression_System_Func__0_System_Boolean___.md&amp;value=---%0Auid%3A%20FreeSql.ISelectFromExpression%601.WhereIf(System.Boolean%2CSystem.Linq.Expressions.Expression%7BSystem.Func%7B%600%2CSystem.Boolean%7D%7D)%0Asummary%3A%20'*You%20can%20override%20summary%20for%20the%20API%20here%20using%20*MARKDOWN*%20syntax'%0A---%0A%0A*Please%20type%20below%20more%20information%20about%20this%20API%3A*%0A%0A">Improve this Doc</a>
</span>
<span class="small pull-right mobile-hide">
<a href="https://github.com/dotnetcore/FreeSql/blob/master/FreeSql/Interface/Curd/ISelect/ISelectFrom.cs/#L26">View Source</a>
</span>
<a id="FreeSql_ISelectFromExpression_1_WhereIf_" data-uid="FreeSql.ISelectFromExpression`1.WhereIf*"></a>
<h4 id="FreeSql_ISelectFromExpression_1_WhereIf_System_Boolean_System_Linq_Expressions_Expression_System_Func__0_System_Boolean___" data-uid="FreeSql.ISelectFromExpression`1.WhereIf(System.Boolean,System.Linq.Expressions.Expression{System.Func{`0,System.Boolean}})">WhereIf(Boolean, Expression&lt;Func&lt;T1, Boolean&gt;&gt;)</h4>
<div class="markdown level1 summary"><p>查询条件Where(true, a =&gt; a.Id &gt; 10)支导航对象查询Where(true, a =&gt; a.Author.Email == &quot;2881099@qq.com&amp;quot;)</p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">ISelectFromExpression&lt;T1&gt; WhereIf(bool condition, Expression&lt;Func&lt;T1, bool&gt;&gt; exp)</code></pre>
</div>
<h5 class="parameters">Parameters</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Name</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><span class="xref">System.Boolean</span></td>
<td><span class="parametername">condition</span></td>
<td><p>true 时生效</p>
</td>
</tr>
<tr>
<td><span class="xref">System.Linq.Expressions.Expression</span>&lt;<span class="xref">System.Func</span>&lt;T1, <span class="xref">System.Boolean</span>&gt;&gt;</td>
<td><span class="parametername">exp</span></td>
<td><p>lambda表达式</p>
</td>
</tr>
</tbody>
</table>
<h5 class="returns">Returns</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><a class="xref" href="FreeSql.ISelectFromExpression-1.html">ISelectFromExpression</a>&lt;T1&gt;</td>
<td></td>
</tr>
</tbody>
</table>
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